Crypt::CBC versions between 1.21 and 3.05 for Perl may use insecure rand() function for cryptographic functions

published 2025-04-12 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-10846

cvss: 4.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits: 0; none known

Crypt::CBC versions between 1.21 and 3.05 for Perl may use the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

This issue affects operating systems where "/dev/urandom'" is unavailable. In that case, Crypt::CBC will fallback to use the insecure rand() function.

Patch / fix

distros 2 links 1

debian opensuse

libcrypt-cbc-perl Debian 14 3.07-1

debian advisories DEBIAN-CVE-2025-2814

perl-Crypt-CBC openSUSE Tumbleweed 3.70.0-1.1

opensuse advisories openSUSE-SU-2025:15495-1

github.com/lstein/Lib-Crypt-CBC@37111f7 commit

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-2814 updated 2026-11-07 cvss 4.8

Crypt-CBC: Crypt::CBC versions between 1.21 and 3.04 for Perl may use insecure rand() function for cryptographic functions

Red Hat Enterprise Linux 7 perl-Crypt-CBC
affected: workaround, no fix planned “Out of support scope”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-14)

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.0	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA	3.1	4.0	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

LDS Crypt::CBC

Classification

Weakness

CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
CWE-329 Generation of Predictable IV with CBC Mode
CWE-331 Insufficient Entropy

References

Sources

CVE List CVE-2025-2814
NVD CVE-2025-2814

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary