CVE-2025-40820 (GCVE-0-2025-40820)
Vulnerability from cvelistv5 – Published: 2025-12-09 10:44 – Updated: 2025-12-09 15:55
VLAI
EPSS
VEX
Summary
Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-09 15:52 UTC
CWE
- CWE-940 - Improper Verification of Source of a Communication Channel
Assigner
References
1 reference
Impacted products
145 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Siemens | SIDOOR ATD430W |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIDOOR ATE530G COATED |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIDOOR ATE530S COATED |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC CFU DIQ |
Affected:
0 , < V2.0.0
(custom)
|
guessed | |
| Siemens | SIMATIC CFU PA |
Affected:
0 , < V2.0.0
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200AL IM 157-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200clean, CM 8x IO-Link |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200clean, DI 16x24VDC |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200clean, DIQ 16x24VDC/0,5A |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, AI 8xRTD/TC, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, CM 4x IO-Link, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, CM 8x IO-Link, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, DI 16x24VDC, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, DI 8x24VDC, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, DIQ 16x24VDC/2A, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, DQ 8x24VDC/0,5A, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200eco PN, DQ 8x24VDC/2A, M12-L |
Affected:
V5.1.1 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200MP IM 155-5 PN HF |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200pro IM 154-8 PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200pro IM 154-8F PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200pro IM 154-8FX PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200S IM 151-8 PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200S IM 151-8F PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP CPU 1510SP F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP CPU 1510SP-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP CPU 1512SP F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP CPU 1512SP-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP IM 155-6 MF HF |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP IM 155-6 PN HA (incl. SIPLUS variants) |
Affected:
0 , < V1.3
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP IM 155-6 PN HF |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP IM 155-6 PN/2 HF |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC ET 200SP IM 155-6 PN/3 HF |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC PN/MF Coupler |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC PN/PN Coupler |
Affected:
0 , < V6.0.0
(custom)
|
guessed | |
| Siemens | SIMATIC Power Line Booster PLB, Base Module |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC Power Line Booster PLB, Modem Module ST |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1211C AC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1211C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1211C DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1212C AC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1212C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1212C DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1212FC DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1212FC DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1214C AC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1214C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1214C DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1214FC DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1214FC DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1215C AC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1215C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1215C DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1215FC DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1215FC DC/DC/Rly |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1200 CPU 1217C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1511-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1511F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1513-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1513F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1515-2 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1515F-2 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1516-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1516F-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU CR40 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU CR60 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU SR20 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU SR30 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU SR40 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU SR60 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU ST20 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU ST30 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU ST40 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-200 SMART CPU ST60 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 314C-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 315-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 315F-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 315T-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 317-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 317F-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 317T-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 317TF-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 319-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-300 CPU 319F-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-400 CPU 412-2 PN V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-400 CPU 414-3 PN/DP V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-400 CPU 414F-3 PN/DP V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-400 CPU 416-3 PN/DP V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-400 CPU 416F-3 PN/DP V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) |
Affected:
0 , < V10.2
(custom)
|
guessed | |
| Siemens | SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) |
Affected:
0 , < V8.3
(custom)
|
guessed | |
| Siemens | SIMATIC TDC CP51M1 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC TDC CPU555 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMOCODE pro V Ethernet/IP (incl. SIPLUS variants) |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMOCODE pro V PROFINET |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SINUMERIK 840D sl |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200MP IM 155-5 PN HF |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200MP IM 155-5 PN HF T1 RAIL |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200S IM 151-8 PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200S IM 151-8F PN/DP CPU |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200SP CPU 1512SP F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200SP IM 155-6 PN HF |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200SP IM 155-6 PN HF T1 RAIL |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS ET 200SP IM 155-6 PN HF TX RAIL |
Affected:
V4.2.0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS HCS4200 CIM4210 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS HCS4200 CIM4210C |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS HCS4300 CIM4310 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS NET PN/PN Coupler |
Affected:
0 , < V6.0.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1212 AC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1212 DC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1212C AC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1212C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1212C DC/DC/DC RAIL |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214 AC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214 DC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214C AC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214C DC/DC/DC RAIL |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214C DC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214FC DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1214FC DC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1215 AC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1215 DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1215 DC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1215C AC/DC/RLY |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1215C DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1200 CPU 1215FC DC/DC/DC |
Affected:
0 , < V4.4.0
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1511-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1511F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1513-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1513F-1 PN |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1516-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1516F-3 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-300 CPU 314C-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-300 CPU 315-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-300 CPU 315F-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-300 CPU 317-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-300 CPU 317F-2 PN/DP |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-400 CPU 414-3 PN/DP V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-400 CPU 416-3 PN/DP V7 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIWAREX WP231 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIWAREX WP241 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIWAREX WP251 |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIWAREX WP521 ST |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIWAREX WP522 ST |
Affected:
0 , < *
(custom)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-40820",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-12-09T15:52:45.674847Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2025-12-09T15:55:23.400Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "SIDOOR ATD430W",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIDOOR ATE530G COATED",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIDOOR ATE530S COATED",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC CFU DIQ",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V2.0.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC CFU PA",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V2.0.0",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC CFU PA",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V2.0.0",
"status": "affected",
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{
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{
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{
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{
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{
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},
{
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},
{
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{
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{
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{
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},
{
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]
},
{
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]
},
{
"defaultStatus": "unknown",
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]
},
{
"defaultStatus": "unknown",
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]
},
{
"defaultStatus": "unknown",
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{
"lessThan": "*",
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]
},
{
"defaultStatus": "unknown",
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{
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}
]
},
{
"defaultStatus": "unknown",
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{
"lessThan": "*",
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]
},
{
"defaultStatus": "unknown",
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{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
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{
"lessThan": "*",
"status": "affected",
"version": "0",
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}
]
},
{
"defaultStatus": "unknown",
"product": "SIWAREX WP521 ST",
"vendor": "Siemens",
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{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
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{
"lessThan": "*",
"status": "affected",
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]
}
],
"descriptions": [
{
"lang": "en",
"value": "Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"cvssV4_0": {
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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}
}
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{
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{
"cweId": "CWE-940",
"description": "CWE-940: Improper Verification of Source of a Communication Channel",
"lang": "en",
"type": "CWE"
}
]
}
],
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"orgId": "cec7a2ec-15b4-4faf-bd53-b40f371f3a77",
"shortName": "siemens"
},
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-915282.html"
}
]
}
},
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"cveId": "CVE-2025-40820",
"datePublished": "2025-12-09T10:44:30.977Z",
"dateReserved": "2025-04-16T08:50:26.975Z",
"dateUpdated": "2025-12-09T15:55:23.400Z",
"state": "PUBLISHED"
},
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"epss": {
"cve": "CVE-2025-40820",
"date": "2026-09-14",
"epss": "0.0049",
"percentile": "0.40683"
},
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"redhat_vex": {
"current_release_date": "2025-12-10T11:33:36+00:00",
"cve": "CVE-2025-40820",
"id": "CVE-2025-40820",
"initial_release_date": "2025-01-01T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "CVE-2025-40820",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40820.json",
"version": "3"
},
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\"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIWAREX WP522 ST\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\"}}, {\"cvssV4_0\": {\"version\": \"4.0\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"baseScore\": 8.7, \"baseSeverity\": \"HIGH\"}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"cweId\": \"CWE-940\", \"description\": \"CWE-940: Improper Verification of Source of a Communication Channel\", \"type\": \"CWE\"}]}], \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-915282.html\"}]}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-40820\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-12-09T15:52:45.674847Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-12-09T15:55:01.982Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2025-40820\", \"assignerOrgId\": \"cec7a2ec-15b4-4faf-bd53-b40f371f3a77\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"siemens\", \"dateReserved\": \"2025-04-16T08:50:26.975Z\", \"datePublished\": \"2025-12-09T10:44:30.977Z\", \"dateUpdated\": \"2025-12-09T15:55:23.400Z\"}",
"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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