What’s Vulnerable › Vulnerabilities

CVE-2025-2814: Crypt::CBC versions between 1.21 and 3.05 for Perl may use insecure rand() function for cryptographic functions

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-13 · updated 2026-06-17
• Weakness: CWE-329

Description

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.

Affected products

• LDS Crypt::CBC: from 1.21 through 3.05

References

• https://github.com/lstein/Lib-Crypt-CBC/commit/37111f7cd894bcec46156ba7f40a49c126ebf535.patch
• https://metacpan.org/dist/Crypt-CBC/source/lib/Crypt/CBC.pm#L777
• https://perldoc.perl.org/functions/rand
• https://security.metacpan.org/docs/guides/random-data-for-security.html

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