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CVE-2009-3294

The popen API function in TSRM/tsrm_win32.c in PHP before 5.2.11 and 5.3.x before 5.3.1, when running on certain Windows operating systems, allows context-dependent attackers to cause a denial of service (crash) via a crafted (1) "e" or (2) "er" string in the second argument (aka mode), possibly related to the _fdopen function in the Microsoft C runtime library. NOTE: this might not cross…

Severity
Medium 5.0
Published
22 Sept 2009
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Fixed in
5.2.11, 5.3.1
Exploit chance
2.7% in the next 30 daysHigher than 86% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Format string (CWE-134)
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Description

The popen API function in TSRM/tsrm_win32.c in PHP before 5.2.11 and 5.3.x before 5.3.1, when running on certain Windows operating systems, allows context-dependent attackers to cause a denial of service (crash) via a crafted (1) "e" or (2) "er" string in the second argument (aka mode), possibly related to the _fdopen function in the Microsoft C runtime library. NOTE: this might not cross privilege boundaries except in rare cases in which the mode argument is accessible to an attacker outside of an application that uses the popen function.

From NVD.

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • From 5.2.0 before 5.2.11
  • From 5.3.0 before 5.3.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2009-3294
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2009-3294