CVE-2006-1991
CVE-2006-1991 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.
Key facts
- Severity: Medium (CVSS 2.0 base score 6.4)
- EPSS exploit prediction: 2% (80th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-399
- Affected product: Php
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2006-1991?
- CVE-2006-1991 has a CVSS 2.0 base score of 6.4, rated medium severity.
- Is CVE-2006-1991 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2006-1991?
- CVE-2006-1991 affects Php. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2006-1991?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2006-1991 published?
- CVE-2006-1991 was published on 2006-04-24 and last updated on 2026-06-16.
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
Affected products (1)
- cpe:2.3:a:php:php:5.1.2:*:*:*:*:*:*:*
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