CVE-2015-8867: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 4.4% chance of exploitation in the next 30 days.

The openssl_random_pseudo_bytes function in ext/openssl/openssl.c in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 incorrectly relies on the deprecated RAND_pseudo_bytes function, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only
• PHP PHP: from 5.4.0, before 5.4.44 (fixed in 5.4.44); from 5.5.0, before 5.5.28 (fixed in 5.5.28); from 5.6.0, before 5.6.12 (fixed in 5.6.12)

Published 2016-05-22. Last modified 2026-06-17.