Is CVE-2011-2943 in the CISA KEV catalog?

No. CVE-2011-2943 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-2943?

CVE-2011-2943 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2011-2943?

CVE-2011-2943 has an EPSS score of 3.60% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-2943?

Upgrade pidgin on debian 11 to 2.10.0-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-2943

MEDIUMEPSS 88th pctl

4.3

CVSS v2

NVD

Description

The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.

How to fix

Remediation Available

pidginDebian

Fixed in:2.10.0-1CVE-2011-2943

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

3.60%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch3

Vendor Advisory1

secunia.com

Other references8

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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.