CVE-2025-40925
Published: 20 September 2025
Summary
CVE-2025-40925 is a critical-severity PRNG (CWE-338) vulnerability. Its CVSS base score is 9.1 (Critical).
Operationally, ranked at the 22.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-30364
Vulnerability details
Starch versions 0.14 and earlier generate session ids insecurely. The default session id generator returns a SHA-1 hash seeded with a counter, the epoch time, the built-in rand function, the PID, and internal Perl reference addresses. The PID will come…
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from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. Predicable session ids could allow an attacker to gain access to systems.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Cryptographic key management standards require cryptographically strong PRNGs for key material, blocking use of weak generators.
Security associations share details on cryptographically weak PRNGs, helping avoid their implementation in security-critical functions.