CVE-2011-4957

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-06-27 · updated 2026-06-16
Weakness: CWE-20

Description

The make_clickable function in wp-includes/formatting.php in WordPress before 3.1.1 does not properly check URLs before passing them to the PCRE library, which allows remote attackers to cause a denial of service (crash) via a comment with a crafted URL that triggers many recursive calls.

Affected products

WordPress: through 3.1; 0.71, 1.0, 1.0.1, 1.0.2, 1.1.1, 1.2 (+68)

References

http://core.trac.wordpress.org/ticket/16892
http://secunia.com/advisories/44038
http://secunia.com/advisories/49138
http://wordpress.org/news/2011/04/wordpress-3-1-1/
http://www.debian.org/security/2012/dsa-2470
http://www.openwall.com/lists/oss-security/2012/04/19/17
http://www.openwall.com/lists/oss-security/2012/04/19/6
http://core.trac.wordpress.org/ticket/16892
http://secunia.com/advisories/44038
http://secunia.com/advisories/49138
http://wordpress.org/news/2011/04/wordpress-3-1-1/
http://www.debian.org/security/2012/dsa-2470

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