CVE-2006-1991: php Resource Management Errors
Vulnerability summary
CVE-2006-1991 is a medium (CVSS 6.4) Resource Management Errors vulnerability in php. EPSS estimates a 2.24% chance of exploitation in the next 30 days, higher than 82.8% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 6.4, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 24-04-2006PublishedVulnerability first disclosed.
- 07-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
2.24%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
Increase +0.05 pp
From 2.19% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (infigo.hr)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.
Php1 product
- phpEOL5.1.2
1 vendor · 1 product