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Servers and applications

CVE-2011-3379

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.

Severity
High 7.5
Published
3 Nov 2011
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
5% in the next 30 daysHigher than 92% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Code injection (CWE-94)
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • Version 5.3.7
  • Version 5.3.8

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-3379
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-3379