Is CVE-2011-4957 in the CISA KEV catalog?

No. CVE-2011-4957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4957?

CVE-2011-4957 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-4957?

CVE-2011-4957 has an EPSS score of 3.16% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4957?

Upgrade wordpress on debian 11 to 3.2.1+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-4957

MEDIUMEPSS 86th pctl

5.0

CVSS v2

NVD

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.

CWE-20Improper Input Validation

How to fix

Remediation Available

wordpressDebian

Fixed in:3.2.1+dfsg-1CVE-2011-4957

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.16%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Vendor Advisory2

Other references5

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.