CVE-2026-20293 (GCVE-0-2026-20293)
Vulnerability from cvelistv5 – Published: 2026-09-08 16:04 – Updated: 2026-09-11 13:46
VLAI
EPSS
VEX
Title
Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability
Summary
A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.
This vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 13:32 UTC
CWE
- CWE-749 - Exposed Dangerous Method or Function
Assigner
References
1 reference
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Cisco | Cisco Enterprise NFV Infrastructure Software |
Affected:
4.1.1
Affected: 3.9.1 Affected: 3.5.2 Affected: 3.12.2 Affected: 3.6.2 Affected: 3.9.2 Affected: 3.11.3 Affected: 3.11.1 Affected: 3.5.1 Affected: 3.3.1 Affected: 3.10.2 Affected: 3.12.1b Affected: 3.4.1 Affected: 3.12.1a Affected: 3.6.3 Affected: 3.8.1 Affected: 3.11.2 Affected: 3.12.1 Affected: 3.12.3 Affected: 3.10.1 Affected: 3.6.1 Affected: 3.10.3 Affected: 3.7.1 Affected: 4.1.2 Affected: 4.2.1 Affected: 4.2.2 Affected: 4.4.1 Affected: 4.4.2 Affected: 4.5.1 Affected: 4.4.3 Affected: 4.6.1 Affected: 4.7.1 Affected: 4.6.2-FC2 Affected: 4.6.2 Affected: 4.8.1 Affected: 4.8.2 Affected: 4.9.1 Affected: 4.6.3 Affected: 4.9.2 Affected: 4.10.1 Affected: 4.9.3 Affected: 4.11.1 Affected: 4.9.4 Affected: 4.12.1 Affected: 4.6.4 Affected: 4.12.2 Affected: 4.13.1 Affected: 4.9.5 Affected: 4.12.3 Affected: 4.14.1 Affected: 4.6.3-FC4 Affected: 4.9.4-FC3 Affected: 4.12.4 Affected: 4.15.1 Affected: 4.9.6 Affected: 4.15.2 Affected: 4.12.5 Affected: 4.15.3 Affected: 4.15.4 Affected: 4.12.6 Affected: 4.15.5 Affected: 4.12.7 Affected: 4.12.8 Affected: 4.15.6 Affected: 4.9.10 |
guessed | |
| Cisco | Cisco Unified Computing System (Managed) |
Affected:
4.0(1a)
Affected: 4.1(1a) Affected: 4.1(1b) Affected: 4.0(4h) Affected: 4.1(1c) Affected: 4.0(4e) Affected: 4.0(4g) Affected: 4.0(2e) Affected: 4.0(4a) Affected: 4.0(2d) Affected: 4.0(1b) Affected: 4.0(4f) Affected: 4.0(4c) Affected: 4.0(1c) Affected: 4.0(4b) Affected: 4.0(2b) Affected: 4.0(4d) Affected: 4.0(2a) Affected: 4.0(1d) Affected: 4.0(4i) Affected: 4.1(1d) Affected: 4.1(2a) Affected: 4.1(1e) Affected: 4.1(2b) Affected: 4.0(4k) Affected: 4.1(3a) Affected: 4.1(3b) Affected: 4.1(2c) Affected: 4.0(4l) Affected: 4.1(4a) Affected: 4.1(3c) Affected: 4.1(3d) Affected: 4.2(1c) Affected: 4.2(1d) Affected: 4.0(4m) Affected: 4.1(3e) Affected: 4.2(1f) Affected: 4.1(3f) Affected: 4.2(1i) Affected: 4.2(1k) Affected: 4.0(4n) Affected: 4.1(3h) Affected: 4.2(1l) Affected: 4.2(1m) Affected: 4.1(3i) Affected: 4.2(2a) Affected: 4.2(1n) Affected: 4.1(3j) Affected: 4.2(2c) Affected: 4.2(2d) Affected: 4.2(3b) Affected: 4.1(3k) Affected: 4.0(4o) Affected: 4.2(2e) Affected: 4.2(3d) Affected: 4.2(3e) Affected: 4.2(3g) Affected: 4.1(3l) Affected: 4.3(2b) Affected: 4.2(3h) Affected: 4.2(3i) Affected: 4.3(2c) Affected: 4.1(3m) Affected: 4.3(2e) Affected: 4.3(3a) Affected: 4.2(3j) Affected: 4.3(3c) Affected: 4.3(4a) Affected: 4.2(3k) Affected: 4.3(4b) Affected: 4.3(4c) Affected: 4.2(3l) Affected: 4.3(4d) Affected: 4.2(3m) Affected: 4.3(2f) Affected: 4.3(5a) Affected: 4.3(4e) Affected: 4.1(3n) Affected: 4.3(4f) Affected: 4.2(3n) Affected: 4.3(5c) Affected: 4.2(3o) Affected: 4.3(5d) Affected: 4.3(6a) Affected: 4.3(6b) Affected: 4.3(5e) Affected: 4.3(6c) Affected: 6.0(1b) Affected: 4.2(3p) Affected: 6.0(1c) Affected: 4.3(6d) Affected: 6.0(1d) Affected: 6.0(1e) Affected: 4.3(6e) Affected: 6.0(1f) Affected: 4.3(6f) Affected: 6.0(2b) Affected: 6.0(1h) Affected: 4.2(3r) Affected: 6.0(2c) Affected: 4.3(6g) |
guessed | |
| Cisco | Cisco Unified Computing System (Standalone) |
Affected:
4.0(2g)
Affected: 3.1(2i) Affected: 3.1(1d) Affected: 4.0(4i) Affected: 4.1(1c) Affected: 4.0(2c) Affected: 4.0(1e) Affected: 4.0(2h) Affected: 4.0(4h) Affected: 4.0(1h) Affected: 4.0(2l) Affected: 3.1(3g) Affected: 4.0(1.240) Affected: 4.0(2f) Affected: 4.0(1g) Affected: 4.0(2i) Affected: 3.1(3i) Affected: 4.0(4d) Affected: 4.1(1d) Affected: 3.1(3c) Affected: 4.0(4k) Affected: 3.1(2d) Affected: 3.1(3a) Affected: 3.1(3j) Affected: 4.0(2d) Affected: 4.1(1f) Affected: 4.0(4j) Affected: 4.0(2m) Affected: 4.0(2k) Affected: 4.0(1c) Affected: 4.0(4f) Affected: 4.0(4c) Affected: 3.1(3d) Affected: 3.1(2g) Affected: 3.1(2c) Affected: 4.0(1d) Affected: 3.1(2e) Affected: 4.0(1a) Affected: 4.0(1b) Affected: 3.1(3b) Affected: 4.0(4b) Affected: 3.1(2b) Affected: 4.0(4e) Affected: 3.1(3h) Affected: 4.0(4l) Affected: 4.1(1g) Affected: 4.1(2a) Affected: 4.0(2n) Affected: 4.1(1h) Affected: 3.1(3k) Affected: 4.1(2b) Affected: 4.0(2o) Affected: 4.0(4m) Affected: 4.1(2d) Affected: 4.1(3b) Affected: 4.0(2p) Affected: 4.1(2e) Affected: 4.1(2f) Affected: 4.0(4n) Affected: 4.0(2q) Affected: 4.1(3c) Affected: 4.0(2r) Affected: 4.1(3d) Affected: 4.1(2g) Affected: 4.1(2h) Affected: 4.1(3g) Affected: 4.1(3f) Affected: 4.1(2j) Affected: 4.1(2k) Affected: 4.1(3h) Affected: 4.2(2a) Affected: 4.1(3i) Affected: 4.2(2f) Affected: 4.2(2g) Affected: 4.2(3b) Affected: 4.1(3l) Affected: 4.2(3d) Affected: 4.3(1.230097) Affected: 4.2(1e) Affected: 4.2(1b) Affected: 4.2(1j) Affected: 4.2(1i) Affected: 4.2(1f) Affected: 4.2(1a) Affected: 4.2(1c) Affected: 4.2(1g) Affected: 4.3(1.230124) Affected: 4.1(2l) Affected: 4.2(3e) Affected: 4.3(1.230138) Affected: 4.2(3g) Affected: 4.3(2.230207) Affected: 4.2(3h) Affected: 4.2(3i) Affected: 4.3(2.230270) Affected: 4.1(3m) Affected: 4.1(2m) Affected: 4.3(2.240002) Affected: 4.3(3.240022) Affected: 4.2(3j) Affected: 4.1(3n) Affected: 4.3(2.240009) Affected: 4.3(3.240041) Affected: 4.2(3k) Affected: 4.3(3.240043) Affected: 4.3(4.240142) Affected: 4.3(2.240037) Affected: 4.3(2.240053) Affected: 4.3(4.240152) Affected: 4.2(3l) Affected: 4.3(2.240077) Affected: 4.3(4.242028) Affected: 4.3(4.241063) Affected: 4.3(4.242038) Affected: 4.2(3m) Affected: 4.3(2.240090) Affected: 4.3(5.240021) Affected: 4.3(2.240107) Affected: 4.3(4.242066) Affected: 4.2(3n) Affected: 4.3(5.250001) Affected: 4.2(3o) Affected: 4.3(2.250016) Affected: 4.3(2.250021) Affected: 4.3(5.250030) Affected: 4.3(2.250022) Affected: 4.3(6.250039) Affected: 4.3(6.250040) Affected: 4.3(5.250033) Affected: 4.3(6.250044) Affected: 4.3(6.250053) Affected: 4.3(2.250037) Affected: 4.3(2.250045) Affected: 4.3(4.252001) Affected: 4.3(4.252002) Affected: 6.0(1.250127) Affected: 4.2(3p) Affected: 6.0(1.250131) Affected: 4.3(6.250101) Affected: 6.0(1.250174) Affected: 4.3(6.250117) Affected: 4.3(5.250043) Affected: 4.3(5.250045) Affected: 4.3(6.250060) Affected: 6.0(1.250130) Affected: 4.3(4.241014) Affected: 6.0(1.251030) Affected: 4.3(2.250063) Affected: 6.0(1.250192) Affected: 4.3(6.260003) Affected: 6.0(1.250194) Affected: 6.0(1.260001) Affected: 4.3(6.260017) Affected: 4.3(2.260007) Affected: 6.0(2.260044) Affected: 6.0(2.260042) Affected: 4.0(1.260003) Affected: 2.0(2.260062) Affected: 2.0(1.250127) Affected: 2.0(1.250096) Affected: 4.0(1.260004) Affected: 6.0(2.260026) Affected: 6.0(1.251006) Affected: 1.2(0.250011) Affected: 1.1(0.250016) Affected: 1.0(0.240001) Affected: 1.0(0.250003) Affected: 1.2(0.250013) Affected: 1.1(0.250026) Affected: 1.0(1.250002) Affected: 1.1(0.250022) Affected: 1.1(0.250025) Affected: 1.0(1.250032) Affected: 6.0(2.260034) Affected: 6.0(2.260069) Affected: 4.3(6.260033) Affected: 2.0(2.260101) Affected: 4.2(3q) Affected: 4.2(3r) Affected: 1.2(0.260005) |
guessed | |
| Cisco | Cisco Unified Computing System E-Series Software (UCSE) |
Affected:
4.11.1
Affected: 4.12.1 Affected: 4.12.2 Affected: 4.15.2 Affected: 4.15.3 Affected: 4.15.4 |
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20293",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-11T13:32:52.855324Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-11T13:46:30.170Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Cisco Enterprise NFV Infrastructure Software",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "4.1.1"
},
{
"status": "affected",
"version": "3.9.1"
},
{
"status": "affected",
"version": "3.5.2"
},
{
"status": "affected",
"version": "3.12.2"
},
{
"status": "affected",
"version": "3.6.2"
},
{
"status": "affected",
"version": "3.9.2"
},
{
"status": "affected",
"version": "3.11.3"
},
{
"status": "affected",
"version": "3.11.1"
},
{
"status": "affected",
"version": "3.5.1"
},
{
"status": "affected",
"version": "3.3.1"
},
{
"status": "affected",
"version": "3.10.2"
},
{
"status": "affected",
"version": "3.12.1b"
},
{
"status": "affected",
"version": "3.4.1"
},
{
"status": "affected",
"version": "3.12.1a"
},
{
"status": "affected",
"version": "3.6.3"
},
{
"status": "affected",
"version": "3.8.1"
},
{
"status": "affected",
"version": "3.11.2"
},
{
"status": "affected",
"version": "3.12.1"
},
{
"status": "affected",
"version": "3.12.3"
},
{
"status": "affected",
"version": "3.10.1"
},
{
"status": "affected",
"version": "3.6.1"
},
{
"status": "affected",
"version": "3.10.3"
},
{
"status": "affected",
"version": "3.7.1"
},
{
"status": "affected",
"version": "4.1.2"
},
{
"status": "affected",
"version": "4.2.1"
},
{
"status": "affected",
"version": "4.2.2"
},
{
"status": "affected",
"version": "4.4.1"
},
{
"status": "affected",
"version": "4.4.2"
},
{
"status": "affected",
"version": "4.5.1"
},
{
"status": "affected",
"version": "4.4.3"
},
{
"status": "affected",
"version": "4.6.1"
},
{
"status": "affected",
"version": "4.7.1"
},
{
"status": "affected",
"version": "4.6.2-FC2"
},
{
"status": "affected",
"version": "4.6.2"
},
{
"status": "affected",
"version": "4.8.1"
},
{
"status": "affected",
"version": "4.8.2"
},
{
"status": "affected",
"version": "4.9.1"
},
{
"status": "affected",
"version": "4.6.3"
},
{
"status": "affected",
"version": "4.9.2"
},
{
"status": "affected",
"version": "4.10.1"
},
{
"status": "affected",
"version": "4.9.3"
},
{
"status": "affected",
"version": "4.11.1"
},
{
"status": "affected",
"version": "4.9.4"
},
{
"status": "affected",
"version": "4.12.1"
},
{
"status": "affected",
"version": "4.6.4"
},
{
"status": "affected",
"version": "4.12.2"
},
{
"status": "affected",
"version": "4.13.1"
},
{
"status": "affected",
"version": "4.9.5"
},
{
"status": "affected",
"version": "4.12.3"
},
{
"status": "affected",
"version": "4.14.1"
},
{
"status": "affected",
"version": "4.6.3-FC4"
},
{
"status": "affected",
"version": "4.9.4-FC3"
},
{
"status": "affected",
"version": "4.12.4"
},
{
"status": "affected",
"version": "4.15.1"
},
{
"status": "affected",
"version": "4.9.6"
},
{
"status": "affected",
"version": "4.15.2"
},
{
"status": "affected",
"version": "4.12.5"
},
{
"status": "affected",
"version": "4.15.3"
},
{
"status": "affected",
"version": "4.15.4"
},
{
"status": "affected",
"version": "4.12.6"
},
{
"status": "affected",
"version": "4.15.5"
},
{
"status": "affected",
"version": "4.12.7"
},
{
"status": "affected",
"version": "4.12.8"
},
{
"status": "affected",
"version": "4.15.6"
},
{
"status": "affected",
"version": "4.9.10"
}
]
},
{
"defaultStatus": "unknown",
"product": "Cisco Unified Computing System (Managed)",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "4.0(1a)"
},
{
"status": "affected",
"version": "4.1(1a)"
},
{
"status": "affected",
"version": "4.1(1b)"
},
{
"status": "affected",
"version": "4.0(4h)"
},
{
"status": "affected",
"version": "4.1(1c)"
},
{
"status": "affected",
"version": "4.0(4e)"
},
{
"status": "affected",
"version": "4.0(4g)"
},
{
"status": "affected",
"version": "4.0(2e)"
},
{
"status": "affected",
"version": "4.0(4a)"
},
{
"status": "affected",
"version": "4.0(2d)"
},
{
"status": "affected",
"version": "4.0(1b)"
},
{
"status": "affected",
"version": "4.0(4f)"
},
{
"status": "affected",
"version": "4.0(4c)"
},
{
"status": "affected",
"version": "4.0(1c)"
},
{
"status": "affected",
"version": "4.0(4b)"
},
{
"status": "affected",
"version": "4.0(2b)"
},
{
"status": "affected",
"version": "4.0(4d)"
},
{
"status": "affected",
"version": "4.0(2a)"
},
{
"status": "affected",
"version": "4.0(1d)"
},
{
"status": "affected",
"version": "4.0(4i)"
},
{
"status": "affected",
"version": "4.1(1d)"
},
{
"status": "affected",
"version": "4.1(2a)"
},
{
"status": "affected",
"version": "4.1(1e)"
},
{
"status": "affected",
"version": "4.1(2b)"
},
{
"status": "affected",
"version": "4.0(4k)"
},
{
"status": "affected",
"version": "4.1(3a)"
},
{
"status": "affected",
"version": "4.1(3b)"
},
{
"status": "affected",
"version": "4.1(2c)"
},
{
"status": "affected",
"version": "4.0(4l)"
},
{
"status": "affected",
"version": "4.1(4a)"
},
{
"status": "affected",
"version": "4.1(3c)"
},
{
"status": "affected",
"version": "4.1(3d)"
},
{
"status": "affected",
"version": "4.2(1c)"
},
{
"status": "affected",
"version": "4.2(1d)"
},
{
"status": "affected",
"version": "4.0(4m)"
},
{
"status": "affected",
"version": "4.1(3e)"
},
{
"status": "affected",
"version": "4.2(1f)"
},
{
"status": "affected",
"version": "4.1(3f)"
},
{
"status": "affected",
"version": "4.2(1i)"
},
{
"status": "affected",
"version": "4.2(1k)"
},
{
"status": "affected",
"version": "4.0(4n)"
},
{
"status": "affected",
"version": "4.1(3h)"
},
{
"status": "affected",
"version": "4.2(1l)"
},
{
"status": "affected",
"version": "4.2(1m)"
},
{
"status": "affected",
"version": "4.1(3i)"
},
{
"status": "affected",
"version": "4.2(2a)"
},
{
"status": "affected",
"version": "4.2(1n)"
},
{
"status": "affected",
"version": "4.1(3j)"
},
{
"status": "affected",
"version": "4.2(2c)"
},
{
"status": "affected",
"version": "4.2(2d)"
},
{
"status": "affected",
"version": "4.2(3b)"
},
{
"status": "affected",
"version": "4.1(3k)"
},
{
"status": "affected",
"version": "4.0(4o)"
},
{
"status": "affected",
"version": "4.2(2e)"
},
{
"status": "affected",
"version": "4.2(3d)"
},
{
"status": "affected",
"version": "4.2(3e)"
},
{
"status": "affected",
"version": "4.2(3g)"
},
{
"status": "affected",
"version": "4.1(3l)"
},
{
"status": "affected",
"version": "4.3(2b)"
},
{
"status": "affected",
"version": "4.2(3h)"
},
{
"status": "affected",
"version": "4.2(3i)"
},
{
"status": "affected",
"version": "4.3(2c)"
},
{
"status": "affected",
"version": "4.1(3m)"
},
{
"status": "affected",
"version": "4.3(2e)"
},
{
"status": "affected",
"version": "4.3(3a)"
},
{
"status": "affected",
"version": "4.2(3j)"
},
{
"status": "affected",
"version": "4.3(3c)"
},
{
"status": "affected",
"version": "4.3(4a)"
},
{
"status": "affected",
"version": "4.2(3k)"
},
{
"status": "affected",
"version": "4.3(4b)"
},
{
"status": "affected",
"version": "4.3(4c)"
},
{
"status": "affected",
"version": "4.2(3l)"
},
{
"status": "affected",
"version": "4.3(4d)"
},
{
"status": "affected",
"version": "4.2(3m)"
},
{
"status": "affected",
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{
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"product": "Cisco Unified Computing System E-Series Software (UCSE)",
"vendor": "Cisco",
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"status": "affected",
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{
"status": "affected",
"version": "4.12.1"
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{
"status": "affected",
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{
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],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin\u0026nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.\r\n\r\nThis vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.\r\n\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-749",
"description": "Exposed Dangerous Method or Function",
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}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-08T16:04:40.874Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW"
}
],
"source": {
"advisory": "cisco-sa-ucs-uefi-sb-bypass-eb6xC5GW",
"defects": [
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],
"discovery": "EXTERNAL"
},
"title": "Cisco UCS and UCS-Based Appliances UEFI Shell Secure Boot Bypass Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20293",
"datePublished": "2026-09-08T16:04:40.874Z",
"dateReserved": "2025-10-08T11:59:15.405Z",
"dateUpdated": "2026-09-11T13:46:30.170Z",
"state": "PUBLISHED"
},
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"vulnerability-lookup:meta": {
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"cve": "CVE-2026-20293",
"date": "2026-09-12",
"epss": "0.00132",
"percentile": "0.03088"
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"nvd": "{\"cve\":{\"id\":\"CVE-2026-20293\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2026-09-08T17:17:34.047\",\"lastModified\":\"2026-09-11T14:17:25.820\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability in the Unified Extensible Firmware Interface (UEFI) Shell implementation of Cisco UCS Servers and UCS-based appliances could allow an authenticated attacker with valid credentials for a user account with the role of user or admin\u0026nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.\\r\\n\\r\\nThis vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.\"}],\"affected\":[{\"source\":\"psirt@cisco.com\",\"affectedData\":[{\"vendor\":\"Cisco\",\"product\":\"Cisco Enterprise NFV Infrastructure 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valid credentials for a user account with the role of user or admin\u0026nbsp;or an unauthenticated attacker with physical access to an affected device to bypass UEFI Secure Boot validation checks and execute unauthorized software.\\r\\n\\r\\nThis vulnerability is due to the availability of memory write commands in the UEFI Shell while UEFI Secure Boot is enabled on a device. An attacker could exploit this vulnerability by selecting the UEFI Shell boot option at boot time and using available shell commands to modify UEFI memory variables. A successful exploit could allow the attacker to manipulate the preboot environment, overwrite UEFI Secure Boot-related memory values, and execute unauthorized software on the affected device.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-749\", \"description\": \"Exposed Dangerous Method or Function\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-09-08T16:04:40.874Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20293\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-11T13:46:30.170Z\", \"dateReserved\": \"2025-10-08T11:59:15.405Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-09-08T16:04:40.874Z\", \"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.
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.
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