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Servers and applications

CVE-2007-1521

Double free vulnerability in PHP before 4.4.7, and 5.x before 5.2.2, allows context-dependent attackers to execute arbitrary code by interrupting the session_regenerate_id function, as demonstrated by calling a userspace error handler or triggering a memory limit violation.

Severity
Medium 6.8
Published
20 Mar 2007
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
8.6% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • Every version up to 5.2.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2007-1521
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2007-1521