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Fencer Intel
medium 5.0

CVE-2011-5129 json

Heap-based buffer overflow in XChat 2.8.9 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arb…

published 2012-08-30 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-5029

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.7%
EPSS 7.7% chance of exploitation in 30 days, percentile 94%
public exploits
1
Exploit-DB

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-5129 updated cvss 4.3

xchat: Heap-based buffer overflow (crash, ACE) via long response string

  • Red Hat Enterprise Linux 5 xchat Red Hat Enterprise Linux 6 xchat, xchat-tcl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-18159)
  2. Published

Exploit prediction

7.70% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-18159 XChat 2.8.9 - Heap Overflow Denial of Service dos, 2011-11-25
  • securityfocus.com http://www.securityfocus.com/bid/50820 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.org http://packetstormsecurity.org/files/107312/xchat-dos.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.