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CVE-2011-4957

MEDIUM · CVSS 5.0EPSS 3.2%EU EUVD

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.

Key facts

CVSS score
5.0 (v2.0)
Severity
MEDIUM
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness (CWE)
CWE-20
EPSS score
3.2% (88th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2011-4864)
Published
June 27, 2012
NVD last modified
June 16, 2026
Status
Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-4864 in the EU Vulnerability Database. Last updated in EUVD on September 17, 2024.

View on the EU Vulnerability Database

Affected products

  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress
  • wordpress / wordpress

and 25 more…

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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