CVE-2025-40931

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.60% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 48.8% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-03-05 01:41Z7 MO AGO

Last updated

2026-04-21 02:42Z6 MO AGO

Reserved

2025-04-16

Assigning CNA

CPANSec

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS vector

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

Weaknesses

• CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)Base
• CWE-340Generation of Predictable Numbers or IdentifiersClass

Data version

5.2

Document digest

5eec487255a1ada1e8bff8b77a8178bf3b62eb06923cad1ffb35f1cd334c16cc

• metacpan.orghttps://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27
• security.metacpan.orghttps://security.metacpan.org/docs/guides/random-data-for-security.htmltechnical-description
• github.comhttps://github.com/chorny/Apache-Session/issues/4issue-tracking
• rt.cpan.orghttps://rt.cpan.org/Ticket/Display.html?id=173631issue-tracking
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2019/06/15/1mailing-list
• bugs.debian.orghttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930659issue-tracking
• salsa.debian.orghttps://salsa.debian.org/perl-team/modules/packages/libapache-session-perl/-/commit/bdabd71c2f91b18526e31a9dc52b4c17b3d246b7#898a4b8b00022df1b8689910b67707f3e738d180patch
• gitlab.ow2.orghttps://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/1633issue-tracking
• metacpan.orghttps://metacpan.org/pod/Apache::Session::Generate::Random
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/03/05/3