What’s Vulnerable › Vulnerabilities
CVE-2013-3735
- Severity: medium (CVSS 5.0 v2.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.8% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2013-05-31 · updated 2026-06-16
- Weakness: CWE-20
Description
The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment. NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id.
Affected products
- PHP: through 5.4.15; through 5.5.0; 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5 (+23)
References
- https://bugs.php.net/bug.php?id=64660
- https://github.com/php/php-src/blob/php-5.4.16RC1/NEWS
- https://github.com/php/php-src/blob/php-5.5.0RC2/NEWS
- https://github.com/php/php-src/commit/fb58e69a84f4fde603a630d2c9df2fa3be16d846
- https://bugs.php.net/bug.php?id=64660
- https://github.com/php/php-src/blob/php-5.4.16RC1/NEWS
- https://github.com/php/php-src/blob/php-5.5.0RC2/NEWS
- https://github.com/php/php-src/commit/fb58e69a84f4fde603a630d2c9df2fa3be16d846
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