CVE-2011-4957
The make_clickable function in wp-includes/formatting.php in WordPress before 3.1.1 does not...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2011-4957- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2011-4957- Updated
- 2026-11-02
EUVDEUVD-2011-4864 No score
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.
- Record
EUVD-2011-4864- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mf9x-p929-vr83 No score
The make_clickable function in wp-includes/formatting.php in WordPress before 3.1.1 does not...
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.
- Record
GHSA-mf9x-p929-vr83- Weakness
- CWE-20
- Updated
- 2026-11-02
OSV No score
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.
- Record
CVE-2011-4957- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-4957 No score
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.
- Record
DEBIAN-CVE-2011-4957- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
wordpressDebian:12 |
before 3.2.1+dfsg-1 | 3.2.1+dfsg-1 |
wordpressDebian:13 |
before 3.2.1+dfsg-1 | 3.2.1+dfsg-1 |
wordpressDebian:14 |
before 3.2.1+dfsg-1 | 3.2.1+dfsg-1 |
wordpressDebian:6.0 From an advisory covering 15 CVEs |
before 3.3.2+dfsg-1~squeeze1, plus listed versions 3.0.4+dfsg-13.0.5+dfsg-0+squeeze13.0.5+dfsg-13.2.1+dfsg-13.2.1+dfsg-23.2.1+dfsg-33.3+dfsg-13.3.1+dfsg-1 |
3.3.2+dfsg-1~squeeze1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-4957 is a medium vulnerability (CVSS 5.0) in Wordpress, published May 11, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.23%, the 88th percentile. Fixed in wordpress 3.2.1+dfsg-1.