UpHeron
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Servers and applications

CVE-2006-1991

The substr_compare function in string.c in PHP 5.1.2 allows context-dependent attackers to cause a denial of service (memory access violation) via an out-of-bounds offset argument.

Severity
Medium 6.4
Published
24 Apr 2006
Last changed
16 Jun 2026
Added to UpHeron
14 Oct 2026
Exploit chance
2.2% in the next 30 daysHigher than 83% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-399
Attack
Over the network · No login needed
Attacker can
Change some data · Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
PHPServers and applications · cpe:a:php:php
  • Version 5.1.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2006-1991
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2006-1991