CVE-2026-20248 (GCVE-0-2026-20248)
Vulnerability from cvelistv5 – Published: 2026-09-16 20:17 – Updated: 2026-09-17 13:40
VLAI
EPSS
VEX
Title
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software TCP DNS Denial of Service Vulnerability
Summary
A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the TCP DNS response handler to unexpectedly restart, causing the device to reload.
This vulnerability is due to a logic error when parsing a DNS query and tracking the size of the incoming buffers. An attacker could exploit this vulnerability by formatting a crafted reply to a DNS query sent from the targeted device. A successful exploit could allow the attacker to cause the device to reload, causing a denial of service (DoS) condition.
Note: The attacker must be able to respond to DNS queries from the device, either by controlling the DNS service or through a machine-in-the-middle attack.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 13:32 UTC
CWE
- CWE-195 - Signed to Unsigned Conversion Error
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
Affected:
9.16.1
Affected: 9.16.1.28 Affected: 9.16.2 Affected: 9.16.2.3 Affected: 9.16.2.7 Affected: 9.16.2.11 Affected: 9.16.2.13 Affected: 9.16.2.14 Affected: 9.16.3.3 Affected: 9.16.3 Affected: 9.16.3.14 Affected: 9.18.1 Affected: 9.16.3.15 Affected: 9.18.1.3 Affected: 9.18.2 Affected: 9.16.3.19 Affected: 9.16.3.23 Affected: 9.18.2.5 Affected: 9.16.4 Affected: 9.18.2.7 Affected: 9.19.1 Affected: 9.16.4.9 Affected: 9.18.2.8 Affected: 9.16.4.14 Affected: 9.18.3 Affected: 9.19.1.5 Affected: 9.16.4.18 Affected: 9.19.1.9 Affected: 9.18.3.39 Affected: 9.16.4.19 Affected: 9.19.1.12 Affected: 9.18.3.46 Affected: 9.16.4.27 Affected: 9.19.1.18 Affected: 9.18.3.53 Affected: 9.18.3.55 Affected: 9.16.4.38 Affected: 9.16.4.39 Affected: 9.18.3.56 Affected: 9.20.1 Affected: 9.16.4.42 Affected: 9.19.1.22 Affected: 9.18.4 Affected: 9.20.1.5 Affected: 9.18.4.5 Affected: 9.19.1.24 Affected: 9.16.4.48 Affected: 9.18.4.8 Affected: 9.20.2 Affected: 9.19.1.27 Affected: 9.16.4.55 Affected: 9.18.4.22 Affected: 9.20.2.10 Affected: 9.16.4.57 Affected: 9.19.1.28 Affected: 9.18.4.24 Affected: 9.20.2.21 Affected: 9.16.4.61 Affected: 9.19.1.31 Affected: 9.18.4.29 Affected: 9.20.2.22 Affected: 9.16.4.62 Affected: 9.18.4.34 Affected: 9.20.3 Affected: 9.16.4.67 Affected: 9.16.4.70 Affected: 9.18.4.40 Affected: 9.23.1 Affected: 9.22.1.1 Affected: 9.16.4.71 Affected: 9.20.3.4 Affected: 9.18.4.47 Affected: 9.20.3.7 Affected: 9.19.1.37 Affected: 9.16.4.76 Affected: 9.20.3.9 Affected: 9.19.1.38 Affected: 9.18.4.50 Affected: 9.22.1.3 Affected: 9.20.3.10 Affected: 9.22.1.2 Affected: 9.18.4.52 Affected: 9.20.3.13 Affected: 9.22.1.6 Affected: 9.18.4.53 Affected: 9.16.4.82 Affected: 9.22.2 Affected: 9.20.3.16 Affected: 9.19.1.42 Affected: 9.18.4.57 Affected: 9.16.4.84 Affected: 9.23.1.3 Affected: 9.20.3.20 Affected: 9.22.2.4 Affected: 9.23.1.7 Affected: 9.20.4 Affected: 9.22.2.9 Affected: 9.23.1.13 Affected: 9.20.4.7 Affected: 9.22.2.13 Affected: 9.18.4.66 Affected: 9.20.4.10 Affected: 9.23.1.19 Affected: 9.16.4.85 Affected: 9.22.2.14 Affected: 9.18.4.67 Affected: 9.24.1 Affected: 9.18.4.68 Affected: 9.23.1.22 Affected: 9.20.4.14 Affected: 9.22.2.20 Affected: 9.18.4.71 Affected: 9.20.4.19 Affected: 9.23.1.26 Affected: 9.16.4.89 Affected: 9.22.2.32 Affected: 9.18.4.76 Affected: 9.22.3 Affected: 9.24.1.5 Affected: 9.20.4.22 Affected: 9.24.1.9 Affected: 9.20.4.28 Affected: 9.22.3.5 Affected: 9.16.4.92 Affected: 9.18.4.135 Affected: 9.23.1.195 Affected: 9.20.4.30 Affected: 9.24.1.155 Affected: 9.23.1.32 Affected: 9.24.1.11 Affected: 9.20.4.34 Affected: 9.18.4.82 Affected: 9.20.4.235 |
guessed | |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software |
Affected:
7.0.0
Affected: 7.0.0.1 Affected: 7.0.1 Affected: 7.0.1.1 Affected: 7.0.2 Affected: 7.2.0 Affected: 7.0.2.1 Affected: 7.0.3 Affected: 7.2.0.1 Affected: 7.0.4 Affected: 7.2.1 Affected: 7.0.5 Affected: 7.3.0 Affected: 7.2.2 Affected: 7.2.3 Affected: 7.3.1 Affected: 7.2.4 Affected: 7.0.6 Affected: 7.2.5 Affected: 7.2.4.1 Affected: 7.3.1.1 Affected: 7.4.0 Affected: 7.0.6.1 Affected: 7.2.5.1 Affected: 7.4.1 Affected: 7.2.6 Affected: 7.0.6.2 Affected: 7.4.1.1 Affected: 7.2.7 Affected: 7.2.5.2 Affected: 7.3.1.2 Affected: 7.2.8 Affected: 7.6.0 Affected: 7.4.2 Affected: 7.2.8.1 Affected: 7.0.6.3 Affected: 7.4.2.1 Affected: 7.2.9 Affected: 7.0.7 Affected: 7.7.0 Affected: 7.4.2.2 Affected: 7.2.10 Affected: 7.6.1 Affected: 7.4.2.3 Affected: 7.0.8 Affected: 7.6.2 Affected: 7.7.10 Affected: 7.7.11 Affected: 7.0.8.1 Affected: 7.6.2.1 Affected: 7.7.10.1 Affected: 7.4.2.4 Affected: 7.2.10.2 Affected: 7.4.3 Affected: 7.6.4 Affected: 10.0.0 Affected: 7.4.4 Affected: 7.0.9 Affected: 7.2.11 Affected: 7.4.7 |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20248",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-17T13:32:41.718147Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
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"providerMetadata": {
"dateUpdated": "2026-09-17T13:40:58.885Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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"version": "9.16.1.28"
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{
"status": "affected",
"version": "9.16.2"
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
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{
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{
"status": "affected",
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{
"status": "affected",
"version": "9.16.3"
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{
"status": "affected",
"version": "9.16.3.14"
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{
"status": "affected",
"version": "9.18.1"
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{
"status": "affected",
"version": "9.16.3.15"
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{
"status": "affected",
"version": "9.18.1.3"
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{
"status": "affected",
"version": "9.18.2"
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{
"status": "affected",
"version": "9.16.3.19"
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{
"status": "affected",
"version": "9.16.3.23"
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{
"status": "affected",
"version": "9.18.2.5"
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{
"status": "affected",
"version": "9.16.4"
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{
"status": "affected",
"version": "9.18.2.7"
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{
"status": "affected",
"version": "9.19.1"
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{
"status": "affected",
"version": "9.16.4.9"
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{
"status": "affected",
"version": "9.18.2.8"
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{
"status": "affected",
"version": "9.16.4.14"
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{
"status": "affected",
"version": "9.18.3"
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{
"status": "affected",
"version": "9.19.1.5"
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{
"status": "affected",
"version": "9.16.4.18"
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{
"status": "affected",
"version": "9.19.1.9"
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{
"status": "affected",
"version": "9.18.3.39"
},
{
"status": "affected",
"version": "9.16.4.19"
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{
"status": "affected",
"version": "9.19.1.12"
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{
"status": "affected",
"version": "9.18.3.46"
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{
"status": "affected",
"version": "9.16.4.27"
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{
"status": "affected",
"version": "9.19.1.18"
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{
"status": "affected",
"version": "9.18.3.53"
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{
"status": "affected",
"version": "9.18.3.55"
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{
"status": "affected",
"version": "9.16.4.38"
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{
"status": "affected",
"version": "9.16.4.39"
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{
"status": "affected",
"version": "9.18.3.56"
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{
"status": "affected",
"version": "9.20.1"
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{
"status": "affected",
"version": "9.16.4.42"
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{
"status": "affected",
"version": "9.19.1.22"
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{
"status": "affected",
"version": "9.18.4"
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{
"status": "affected",
"version": "9.20.1.5"
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{
"status": "affected",
"version": "9.18.4.5"
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{
"status": "affected",
"version": "9.19.1.24"
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{
"status": "affected",
"version": "9.16.4.48"
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{
"status": "affected",
"version": "9.18.4.8"
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{
"status": "affected",
"version": "9.20.2"
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{
"status": "affected",
"version": "9.19.1.27"
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{
"status": "affected",
"version": "9.16.4.55"
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{
"status": "affected",
"version": "9.18.4.22"
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{
"status": "affected",
"version": "9.20.2.10"
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{
"status": "affected",
"version": "9.16.4.57"
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{
"status": "affected",
"version": "9.19.1.28"
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{
"status": "affected",
"version": "9.18.4.24"
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{
"status": "affected",
"version": "9.20.2.21"
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{
"status": "affected",
"version": "9.16.4.61"
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{
"status": "affected",
"version": "9.19.1.31"
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{
"status": "affected",
"version": "9.18.4.29"
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{
"status": "affected",
"version": "9.20.2.22"
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{
"status": "affected",
"version": "9.16.4.62"
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{
"status": "affected",
"version": "9.18.4.34"
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{
"status": "affected",
"version": "9.20.3"
},
{
"status": "affected",
"version": "9.16.4.67"
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{
"status": "affected",
"version": "9.16.4.70"
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{
"status": "affected",
"version": "9.18.4.40"
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{
"status": "affected",
"version": "9.23.1"
},
{
"status": "affected",
"version": "9.22.1.1"
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{
"status": "affected",
"version": "9.16.4.71"
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{
"status": "affected",
"version": "9.20.3.4"
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{
"status": "affected",
"version": "9.18.4.47"
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{
"status": "affected",
"version": "9.20.3.7"
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{
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"version": "9.19.1.37"
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{
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"version": "9.16.4.82"
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{
"status": "affected",
"version": "9.22.2"
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{
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"version": "9.20.3.16"
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{
"status": "affected",
"version": "9.19.1.42"
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{
"status": "affected",
"version": "9.18.4.57"
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{
"status": "affected",
"version": "9.16.4.84"
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{
"status": "affected",
"version": "9.23.1.3"
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{
"status": "affected",
"version": "9.20.3.20"
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{
"status": "affected",
"version": "9.22.2.4"
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{
"status": "affected",
"version": "9.23.1.7"
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{
"status": "affected",
"version": "9.20.4"
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{
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"version": "9.22.2.9"
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{
"status": "affected",
"version": "9.23.1.13"
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{
"status": "affected",
"version": "9.20.4.7"
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{
"status": "affected",
"version": "9.22.2.13"
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{
"status": "affected",
"version": "9.18.4.66"
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{
"status": "affected",
"version": "9.20.4.10"
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{
"status": "affected",
"version": "9.23.1.19"
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{
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"version": "9.16.4.85"
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{
"status": "affected",
"version": "9.22.2.14"
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{
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"version": "9.18.4.67"
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{
"status": "affected",
"version": "9.24.1"
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{
"status": "affected",
"version": "9.18.4.68"
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{
"status": "affected",
"version": "9.23.1.22"
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{
"status": "affected",
"version": "9.20.4.14"
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{
"status": "affected",
"version": "9.22.2.20"
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{
"status": "affected",
"version": "9.18.4.71"
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{
"status": "affected",
"version": "9.20.4.19"
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{
"status": "affected",
"version": "9.23.1.26"
},
{
"status": "affected",
"version": "9.16.4.89"
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{
"status": "affected",
"version": "9.22.2.32"
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{
"status": "affected",
"version": "9.18.4.76"
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{
"status": "affected",
"version": "9.22.3"
},
{
"status": "affected",
"version": "9.24.1.5"
},
{
"status": "affected",
"version": "9.20.4.22"
},
{
"status": "affected",
"version": "9.24.1.9"
},
{
"status": "affected",
"version": "9.20.4.28"
},
{
"status": "affected",
"version": "9.22.3.5"
},
{
"status": "affected",
"version": "9.16.4.92"
},
{
"status": "affected",
"version": "9.18.4.135"
},
{
"status": "affected",
"version": "9.23.1.195"
},
{
"status": "affected",
"version": "9.20.4.30"
},
{
"status": "affected",
"version": "9.24.1.155"
},
{
"status": "affected",
"version": "9.23.1.32"
},
{
"status": "affected",
"version": "9.24.1.11"
},
{
"status": "affected",
"version": "9.20.4.34"
},
{
"status": "affected",
"version": "9.18.4.82"
},
{
"status": "affected",
"version": "9.20.4.235"
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]
},
{
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"product": "Cisco Secure Firewall Threat Defense (FTD) Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "7.0.0"
},
{
"status": "affected",
"version": "7.0.0.1"
},
{
"status": "affected",
"version": "7.0.1"
},
{
"status": "affected",
"version": "7.0.1.1"
},
{
"status": "affected",
"version": "7.0.2"
},
{
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"version": "7.2.0"
},
{
"status": "affected",
"version": "7.0.2.1"
},
{
"status": "affected",
"version": "7.0.3"
},
{
"status": "affected",
"version": "7.2.0.1"
},
{
"status": "affected",
"version": "7.0.4"
},
{
"status": "affected",
"version": "7.2.1"
},
{
"status": "affected",
"version": "7.0.5"
},
{
"status": "affected",
"version": "7.3.0"
},
{
"status": "affected",
"version": "7.2.2"
},
{
"status": "affected",
"version": "7.2.3"
},
{
"status": "affected",
"version": "7.3.1"
},
{
"status": "affected",
"version": "7.2.4"
},
{
"status": "affected",
"version": "7.0.6"
},
{
"status": "affected",
"version": "7.2.5"
},
{
"status": "affected",
"version": "7.2.4.1"
},
{
"status": "affected",
"version": "7.3.1.1"
},
{
"status": "affected",
"version": "7.4.0"
},
{
"status": "affected",
"version": "7.0.6.1"
},
{
"status": "affected",
"version": "7.2.5.1"
},
{
"status": "affected",
"version": "7.4.1"
},
{
"status": "affected",
"version": "7.2.6"
},
{
"status": "affected",
"version": "7.0.6.2"
},
{
"status": "affected",
"version": "7.4.1.1"
},
{
"status": "affected",
"version": "7.2.7"
},
{
"status": "affected",
"version": "7.2.5.2"
},
{
"status": "affected",
"version": "7.3.1.2"
},
{
"status": "affected",
"version": "7.2.8"
},
{
"status": "affected",
"version": "7.6.0"
},
{
"status": "affected",
"version": "7.4.2"
},
{
"status": "affected",
"version": "7.2.8.1"
},
{
"status": "affected",
"version": "7.0.6.3"
},
{
"status": "affected",
"version": "7.4.2.1"
},
{
"status": "affected",
"version": "7.2.9"
},
{
"status": "affected",
"version": "7.0.7"
},
{
"status": "affected",
"version": "7.7.0"
},
{
"status": "affected",
"version": "7.4.2.2"
},
{
"status": "affected",
"version": "7.2.10"
},
{
"status": "affected",
"version": "7.6.1"
},
{
"status": "affected",
"version": "7.4.2.3"
},
{
"status": "affected",
"version": "7.0.8"
},
{
"status": "affected",
"version": "7.6.2"
},
{
"status": "affected",
"version": "7.7.10"
},
{
"status": "affected",
"version": "7.7.11"
},
{
"status": "affected",
"version": "7.0.8.1"
},
{
"status": "affected",
"version": "7.6.2.1"
},
{
"status": "affected",
"version": "7.7.10.1"
},
{
"status": "affected",
"version": "7.4.2.4"
},
{
"status": "affected",
"version": "7.2.10.2"
},
{
"status": "affected",
"version": "7.4.3"
},
{
"status": "affected",
"version": "7.6.4"
},
{
"status": "affected",
"version": "10.0.0"
},
{
"status": "affected",
"version": "7.4.4"
},
{
"status": "affected",
"version": "7.0.9"
},
{
"status": "affected",
"version": "7.2.11"
},
{
"status": "affected",
"version": "7.4.7"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the TCP DNS\u0026nbsp;response handler to unexpectedly restart, causing the device to reload.\r\n\r\nThis vulnerability is due to a logic error when parsing a DNS query and tracking the size of the incoming buffers. An attacker could exploit this vulnerability by formatting a crafted reply to a DNS query sent from the targeted device. A successful exploit could allow the attacker to cause the device to reload, causing a denial of service (DoS) condition.\r\nNote: The attacker must be able to respond to DNS queries from the device, either by controlling the DNS service or through a machine-in-the-middle attack."
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\"9.18.4.66\"}, {\"status\": \"affected\", \"version\": \"9.20.4.10\"}, {\"status\": \"affected\", \"version\": \"9.23.1.19\"}, {\"status\": \"affected\", \"version\": \"9.16.4.85\"}, {\"status\": \"affected\", \"version\": \"9.22.2.14\"}, {\"status\": \"affected\", \"version\": \"9.18.4.67\"}, {\"status\": \"affected\", \"version\": \"9.24.1\"}, {\"status\": \"affected\", \"version\": \"9.18.4.68\"}, {\"status\": \"affected\", \"version\": \"9.23.1.22\"}, {\"status\": \"affected\", \"version\": \"9.20.4.14\"}, {\"status\": \"affected\", \"version\": \"9.22.2.20\"}, {\"status\": \"affected\", \"version\": \"9.18.4.71\"}, {\"status\": \"affected\", \"version\": \"9.20.4.19\"}, {\"status\": \"affected\", \"version\": \"9.23.1.26\"}, {\"status\": \"affected\", \"version\": \"9.16.4.89\"}, {\"status\": \"affected\", \"version\": \"9.22.2.32\"}, {\"status\": \"affected\", \"version\": \"9.18.4.76\"}, {\"status\": \"affected\", \"version\": \"9.22.3\"}, {\"status\": \"affected\", \"version\": \"9.24.1.5\"}, {\"status\": \"affected\", \"version\": \"9.20.4.22\"}, {\"status\": \"affected\", \"version\": \"9.24.1.9\"}, {\"status\": \"affected\", \"version\": \"9.20.4.28\"}, {\"status\": \"affected\", \"version\": \"9.22.3.5\"}, {\"status\": \"affected\", \"version\": \"9.16.4.92\"}, {\"status\": \"affected\", \"version\": \"9.18.4.135\"}, {\"status\": \"affected\", \"version\": \"9.23.1.195\"}, {\"status\": \"affected\", \"version\": \"9.20.4.30\"}, {\"status\": \"affected\", \"version\": \"9.24.1.155\"}, {\"status\": \"affected\", \"version\": \"9.23.1.32\"}, {\"status\": \"affected\", \"version\": \"9.24.1.11\"}, {\"status\": \"affected\", \"version\": \"9.20.4.34\"}, {\"status\": \"affected\", \"version\": \"9.18.4.82\"}, {\"status\": \"affected\", \"version\": \"9.20.4.235\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Firewall Threat Defense (FTD) Software\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.0.0\"}, {\"status\": \"affected\", \"version\": \"7.0.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.1.1\"}, {\"status\": \"affected\", \"version\": \"7.0.2\"}, {\"status\": \"affected\", \"version\": \"7.2.0\"}, {\"status\": \"affected\", \"version\": \"7.0.2.1\"}, {\"status\": \"affected\", \"version\": \"7.0.3\"}, {\"status\": \"affected\", \"version\": \"7.2.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.4\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.0.5\"}, {\"status\": \"affected\", \"version\": \"7.3.0\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.3\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.2.4\"}, {\"status\": \"affected\", \"version\": \"7.0.6\"}, {\"status\": \"affected\", \"version\": \"7.2.5\"}, {\"status\": \"affected\", \"version\": \"7.2.4.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.1\"}, {\"status\": \"affected\", \"version\": \"7.4.0\"}, {\"status\": \"affected\", \"version\": \"7.0.6.1\"}, {\"status\": \"affected\", \"version\": \"7.2.5.1\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.2.6\"}, {\"status\": \"affected\", \"version\": \"7.0.6.2\"}, {\"status\": \"affected\", \"version\": \"7.4.1.1\"}, {\"status\": \"affected\", \"version\": \"7.2.7\"}, {\"status\": \"affected\", \"version\": \"7.2.5.2\"}, {\"status\": \"affected\", \"version\": \"7.3.1.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8\"}, {\"status\": \"affected\", \"version\": \"7.6.0\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8.1\"}, {\"status\": \"affected\", \"version\": \"7.0.6.3\"}, {\"status\": \"affected\", \"version\": \"7.4.2.1\"}, {\"status\": \"affected\", \"version\": \"7.2.9\"}, {\"status\": \"affected\", \"version\": \"7.0.7\"}, {\"status\": \"affected\", \"version\": \"7.7.0\"}, {\"status\": \"affected\", \"version\": \"7.4.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.10\"}, {\"status\": \"affected\", \"version\": \"7.6.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.3\"}, {\"status\": \"affected\", \"version\": \"7.0.8\"}, {\"status\": \"affected\", \"version\": \"7.6.2\"}, {\"status\": \"affected\", \"version\": \"7.7.10\"}, {\"status\": \"affected\", \"version\": \"7.7.11\"}, {\"status\": \"affected\", \"version\": \"7.0.8.1\"}, {\"status\": \"affected\", \"version\": \"7.6.2.1\"}, {\"status\": \"affected\", \"version\": \"7.7.10.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.4\"}, {\"status\": \"affected\", \"version\": \"7.2.10.2\"}, {\"status\": \"affected\", \"version\": \"7.4.3\"}, {\"status\": \"affected\", \"version\": \"7.6.4\"}, {\"status\": \"affected\", \"version\": \"10.0.0\"}, {\"status\": \"affected\", \"version\": \"7.4.4\"}, {\"status\": \"affected\", \"version\": \"7.0.9\"}, {\"status\": \"affected\", \"version\": \"7.2.11\"}, {\"status\": \"affected\", \"version\": \"7.4.7\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tcpdns-dos-p6dUnjr5\", \"name\": \"cisco-sa-asaftd-tcpdns-dos-p6dUnjr5\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the DNS over TCP implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the TCP DNS\u0026nbsp;response handler to unexpectedly restart, causing the device to reload.\\r\\n\\r\\nThis vulnerability is due to a logic error when parsing a DNS query and tracking the size of the incoming buffers. An attacker could exploit this vulnerability by formatting a crafted reply to a DNS query sent from the targeted device. A successful exploit could allow the attacker to cause the device to reload, causing a denial of service (DoS) condition.\\r\\nNote: The attacker must be able to respond to DNS queries from the device, either by controlling the DNS service or through a machine-in-the-middle attack.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-195\", \"description\": \"Signed to Unsigned Conversion Error\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-09-16T20:17:47.838Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20248\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-17T13:40:58.885Z\", \"dateReserved\": \"2025-10-08T11:59:15.401Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-09-16T20:17:47.838Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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