CVE-2011-1468

Description

Multiple memory leaks in the OpenSSL extension in PHP before 5.3.6 might allow remote attackers to cause a denial of service (memory consumption) via (1) plaintext data to the openssl_encrypt function or (2) ciphertext data to the openssl_decrypt function.

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 6.0	php5	5.3.3-7+squeeze8	DSA-2408-1

Red Hat

Security tracker ↗

Release	Package	Fixed in	Advisory
RHEL 6	php +25	5.3.3-3.el6_1.3	RHSA-2011:1423
RHEL 5	php53 +20	5.3.3-1.el5_7.3	RHSA-2011:1423

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Exploit-DB 2

PHP < 5.3.6 'OpenSSL' Extension - 'openssl_encrypt' Plaintext Data Memory Leak Denial of Service EDB-35486 · dos · Mar 8, 2011 · verified
PHP < 5.3.6 'OpenSSL' Extension - 'openssl_decrypt' Ciphertext Data Memory Leak Denial of Service EDB-35487 · dos · Mar 8, 2011 · verified

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 2

RHSA-2011:1423 Red Hat Security Advisory: php53 and php security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
DSA-2408-1 php5 - several Debian Security (DSA / DLA) · Mar 9, 2026

Multiple memory leaks in the OpenSSL extension in PHP before 5.3.6 might allow remote attackers to cause a denial of service (memory consum…