CVE-2025-40805
Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an unauthenticated remote attacker to circumvent authentication and impersonate a legit...
Affects 0 products across 1 vendor.
Software uses a user-supplied key to access resources without verifying authorization for that specific resource.
CVE-2025-40805 affects Fujitsu-Siemens and Siemens devices, allowing unauthenticated remote attackers to circumvent authentication and impersonate legitimate users. The vulnerability has a CVSS score of 10.0, indicating critical severity. Immediate action is required to mitigate potential risks to operational integrity and security.
BSID: BS-2026-GLOBAL-277275-C • Model: Qwen/Qwen2.5-72B-Instruct-AWQ • Confidence: HIGH
Is this CVE in your environment?
BreachSpider monitors your ICS/OT environment for vulnerabilities like this one. No agents or network access required. Free to start.
Check My Environment →What is CVE-2025-40805?
What is the CVSS score for CVE-2025-40805?
Is CVE-2025-40805 actively exploited?
How do I remediate CVE-2025-40805?
What systems are affected by CVE-2025-40805?
What NERC-CIP standard applies to CVE-2025-40805?
What IEC 62443 requirement maps to CVE-2025-40805?
| CVE ID | CVE-2025-40805 |
|---|---|
| BSID | BS-2026-GLOBAL-277275-C BreachSpider Global ID |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-01-13 |
| Last Modified | 2026-04-15 |
| ICS Relevance | 55% |
| Weakness (CWE) | |
| Verticals | |
| Source | NVD |
Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an unauthenticated remote attacker to circumvent authentication and impersonate a legitimate user. Successful exploitation requires that the attacker has learned the identity of a legitimate user.
Source: NIST NVD / MITRE CVE Database
The vulnerability arises from improper enforcement of user authentication on specific API endpoints. An unauthenticated remote attacker can exploit this issue to bypass authentication mechanisms and gain unauthorized access to the system, potentially leading to full control over the affected device.
Exploitation Likelihood: MEDIUM
| Vendor | Product | Fixed Version |
|---|---|---|
| Siemens | — | — |
No patch URL on record. Monitor vendor security advisories directly.
| CISA KEV | Not in KEV catalog |
|---|---|
| Public Exploit | Not confirmed |
| PoC Code | Not confirmed |
Implement strict access controls and monitor API endpoint usage for unusual activity. Consider deploying a web application firewall (WAF) to filter and block suspicious requests.
No reliable network detection signature exists for this vulnerability class — apply the compensating controls above and the vendor patch. SAGE only publishes a network rule when a concrete on-the-wire signature can be grounded in the advisory.
This CVE violates CIP-007-R2 by failing to ensure that electronic access to BES Cyber Systems is controlled and monitored, which is essential for maintaining the security and reliability of the power grid.
This CVE maps to SR 7.6, which requires that access to system functions and data is restricted to authorized individuals. The lack of proper authentication enforcement directly contravenes this requirement, posing a significant risk to system security.
Virtual patch generated by CITED Relevance SAGE. Validate in isolated environment before production deployment. Compensating control only - does not replace vendor patch.
SAGE Enrichment Record — provenance & audit hash
| Model | Qwen/Qwen2.5-72B-Instruct-AWQ |
|---|---|
| Confidence | HIGH |
| Enriched At | 2026-05-24 |
| SHA-512 Audit Hash | c4d851c9e4b195b68e001ef71d876c562296d676ccf1157f03f3ca7e12742e4683b4cf5a9e0722704cdddd0e59ff9da982c19b8831e2e0b2880fcc8b4283cb7b |
Critical Severity - Know Your Exposure
A CVSS 10.0 vulnerability in your ICS environment cannot wait. BreachSpider maps critical CVEs to your specific assets and tells you what to fix first.
Check Your Assets Free →