Is CVE-2011-5129 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2011-5129, but active exploitation has not been confirmed.

Can CVE-2011-5129 be exploited remotely?

Yes. CVE-2011-5129 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2011-5129?

CVE-2011-5129 has a CVSS score of 5.0 (MEDIUM).

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MEDIUMPOC

CVE-2011-5129

CWE-119Published: August 30, 2012· Updated: Jun 16, 2026

5.0

CVSS v3.1

Official Description

Heap-based buffer overflow in XChat 2.8.9 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long response string.

NVD Source

Technical Analysis

CVE-2011-5129 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2011-5129. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.