What’s Vulnerable › Vulnerabilities

CVE-2006-1991

• Severity: medium (CVSS 6.4 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2006-04-24 · updated 2026-06-16
• Weakness: CWE-399

Description

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.

Affected products

• PHP: 5.1.2

References

• http://secunia.com/advisories/20052
• http://secunia.com/advisories/20269
• http://secunia.com/advisories/20676
• http://secunia.com/advisories/21125
• http://security.gentoo.org/glsa/glsa-200605-08.xml
• http://securitytracker.com/id?1015979
• http://www.infigo.hr/en/in_focus/advisories/INFIGO-2006-04-02
• http://www.mandriva.com/security/advisories?name=MDKSA-2006:091
• http://www.novell.com/linux/security/advisories/2006_31_php.html
• http://www.ubuntu.com/usn/usn-320-1
• http://www.vupen.com/english/advisories/2006/1500
• https://exchange.xforce.ibmcloud.com/vulnerabilities/26003

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