---
title: "CVE-2006-6811\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2006-6811?format=md
keywords: index, follow
---

# CVE-2006-6811

Publication date 29 December 2006

Last updated 17 July 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2006-6811?format=md#impact-score)

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## Description

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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| kdenetwork | 7.04 feisty | Fixed 3.5.6-0ubuntu9 |
| 6.10 edgy | Fixed 3.5.5-0ubuntu1.1 |
| 6.06 LTS dapper | Fixed 3.5.2-0ubuntu6.3 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | Required |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6811)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2006-6811)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2006-6811)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2006-6811)

### Related Ubuntu Security Notices (USN)

+ [USN-409-1](https://usn.ubuntu.com/USN-409-1)
+ ksirc vulnerability
+ 16 January 2007

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2006-6811>