What is the CVSS score of CVE-2025-40931?

CVE-2025-40931 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Apache are affected by CVE-2025-40931?

A critical vulnerability (CVSS 9.1) affecting Apache has been disclosed with no patch currently available, creating immediate risk for any organization running vulnerable versions.

How to fix or mitigate CVE-2025-40931?

Within 24 hours: Inventory all Apache instances and identify vulnerable versions; establish incident response team and enable enhanced logging/monitoring. Within 7 days: Implement compensating controls (WAF rules, network segmentation, disable unnecessary modules); begin testing alternative or hardened Apache configurations. Within 30 days: Prioritize patching immediately upon vendor release; evaluate migration to patched versions or alternative solutions if patch timeline becomes unacceptable.

Apache CVE-2025-40931

CRITICAL

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (CWE-338)

2026-03-05 9b29abf9-4ab0-4765-b253-1875cd9b441e

Apache Information Disclosure

9.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.1 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SUSE

CRITICAL

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 05, 2026 - 02:16 nvd

CRITICAL 9.1

DescriptionCVE.org

Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id.

Apache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the epoch time, and the PID. The PID will come 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.