CVE-2006-6811

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-01. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 11%CVSS: 6.5Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed services: Not assessed

A fix is available — apply it.

KsIRC 1.3.12 allows remote attackers to cause a denial of service (crash) via a long PRIVMSG string when connecting to an Internet Relay Chat (IRC) server, which causes an assertion failure and results in a NULL pointer dereference. NOTE: this issue was originally reported as a buffer overflow.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
60
EG Risk 60/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
11%
EPSS %ILE
95th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 29, 2006

Last Modified

April 23, 2026

Advisory Details (6)

Auto-updated May 31, 2026
🔬 Proof of concept available. Patch available.
generic

VUPEN Security - Vulnerability Research and Intelligence

http://www.vupen.com/english/advisories/2006/5199
generic
http://www.securityfocus.com/bid/21790
generic
http://www.securityfocus.com/archive/1/456379/100/0/threaded
generic🟡 PoC Available
http://www.kde.org/info/security/advisory-20070109-1.txt
generic
http://securitytracker.com/id?1017453
generic

KSirc: Denial of Service vulnerability (GLSA 200701-26) — Gentoo security

http://security.gentoo.org/glsa/glsa-200701-26.xml

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuksirc (4:3.5.5-0ubuntu1.1) @ edgy2026-05-31ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-10-10 19:53 UTCEPSS rescore
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  63. 2026-05-31 05:07 UTCEG score recompute
  64. 2026-05-31 05:07 UTCVendor advisory
  65. 2026-05-31 05:06 UTCGHSA enrichment
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Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 Exploit-DB entry). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-3023✓ verified
    Published Dec 26, 2006

    KsIRC 1.3.12 - 'PRIVMSG' Remote Buffer Overflow (PoC)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2006-6811?
CVE-2006-6811 is a medium vulnerability published on December 29, 2006. KsIRC 1.3.12 allows remote attackers to cause a denial of service (crash) via a long PRIVMSG string when connecting to an Internet Relay Chat (IRC) server, which causes an assertion failure and results in a NULL pointer dereference. NOTE: this issue was originally reported as a buffer overflow.
When was CVE-2006-6811 disclosed?
CVE-2006-6811 was first published on December 29, 2006, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2006-6811 actively exploited?
CVE-2006-6811 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 11% probability of exploitation in the next 30 days (95th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2006-6811?
CVE-2006-6811 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2006-6811?
A fix for CVE-2006-6811 is available: update to the fixed version the vendor names in its advisory.

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