Is CVE-2011-1951 in the CISA KEV catalog?

No. CVE-2011-1951 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-1951?

CVE-2011-1951 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2011-1951?

CVE-2011-1951 has an EPSS score of 2.46% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-1951?

Upgrade syslog-ng on debian 11 to 3.2.4-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-1951

MEDIUMEPSS 83th pctl

4.3

CVSS v2

NVD

Description

lib/logmatcher.c in Balabit syslog-ng before 3.2.4, when the global flag is set and when using PCRE 8.12 and possibly other versions, allows remote attackers to cause a denial of service (memory consumption) via a message that does not match a regular expression.

CWE-399Resource Management Errors

How to fix

Remediation Available

syslog-ngDebian

Fixed in:3.2.4-1CVE-2011-1951

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

2.46%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references1

git.balabit.hu

Related Vulnerabilities

Other CWE-399 (Resource Management Errors) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2009-3103	High	10.0	90%	-	-
CVE-2009-0075	High	9.3	85%	-	-
CVE-2005-1790	Low	2.6	83%	-	-
CVE-2010-0806	High	8.8	82%	KEV	-
CVE-2009-2526	High	7.8	82%	-	-
CVE-2015-1868	High	7.8	82%	-	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.