CVE-2011-3379

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-11-03 · updated 2026-06-16
Weakness: CWE-94

Description

The is_a function in PHP 5.3.7 and 5.3.8 triggers a call to the __autoload function, which makes it easier for remote attackers to execute arbitrary code by providing a crafted URL and leveraging potentially unsafe behavior in certain PEAR packages and custom autoloaders.

Affected products

PHP: 5.3.7, 5.3.8

References

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
http://securityreason.com/securityalert/8525
http://svn.php.net/viewvc/?view=revision&revision=317183
http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/
http://www.securityfocus.com/archive/1/519770/30/0/threaded
https://bugs.php.net/bug.php?id=55475
https://bugzilla.redhat.com/show_bug.cgi?id=741020
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
http://securityreason.com/securityalert/8525
http://svn.php.net/viewvc/?view=revision&revision=317183
http://www.byte.nl/blog/2011/09/23/security-bug-in-is_a-function-in-php-5-3-7-5-3-8/
http://www.securityfocus.com/archive/1/519770/30/0/threaded

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