CVE-2007-1521: php
Vulnerability summary
CVE-2007-1521 is a medium (CVSS 6.8) vulnerability in php. EPSS estimates a 8.61% chance of exploitation in the next 30 days, higher than 95.1% of scored vulnerabilities. 2 public exploits are recorded.
Weaponized exploit (exploit-database, 14-03-2007)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4Timeline
- 20-03-2007PublishedVulnerability first disclosed.
- 07-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
8.61%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
Increase +0.12 pp
From 8.49% 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
2 foundExploit Reference (php-security.org)
Maturity: unknown
PHP 5.2.1 - 'session_regenerate_id()' Double-Free
Maturity: weaponized
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.
Php1 product
- php≤ 5.2.1
1 vendor · 1 product
References
21 links
- us2.php.net/releases/4_4_7.phpX Refsource CONFIRM
Show all 21 references
- us2.php.net/releases/5_2_2.phpX Refsource CONFIRM
- docs.info.apple.com/article.html?artnum=306172X Refsource CONFIRM