---
title: "CVE-2009-2408\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-2009-2408?format=md
keywords: index, follow
---

# CVE-2009-2408

Publication date 30 July 2009

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2009-2408?format=md#impact-score)

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## Description

Mozilla Network Security Services (NSS) before 3.12.3, Firefox before
3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not
properly handle a '\0' character in a domain name in the subject's Common
Name (CN) field of an X.509 certificate, which allows man-in-the-middle
attackers to spoof arbitrary SSL servers via a crafted certificate issued
by a legitimate Certification Authority. NOTE: this was originally reported
for Firefox before 3.5.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| nss | 9.04 jaunty | Fixed 3.12.3.1-0ubuntu0.9.04.1 |
| 8.10 intrepid | Fixed 3.12.3.1-0ubuntu0.8.10.1 |
| 8.04 LTS hardy | Fixed 3.12.3.1-0ubuntu0.8.04.1 |
| 6.06 LTS dapper | Not in release |
| openssl | 9.04 jaunty | Not affected |
| 8.10 intrepid | Not affected |
| 8.04 LTS hardy | Not affected |
| 6.06 LTS dapper | Not affected |
| xulrunner | 9.04 jaunty | Not affected |
| 8.10 intrepid | Not affected |
| 8.04 LTS hardy | Not affected |
| 6.06 LTS dapper | Not in release |
| xulrunner-1.9 | 9.04 jaunty | Not affected |
| 8.10 intrepid | Not affected |
| 8.04 LTS hardy | Not affected |
| 6.06 LTS dapper | Not in release |
| xulrunner-1.9.1 | 9.04 jaunty | Not affected |
| 8.10 intrepid | Not in release |
| 8.04 LTS hardy | Not in release |
| 6.06 LTS dapper | Not in release |

---

* [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**

5.9 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2408)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2009-2408)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2009-2408)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2009-2408)

### Related Ubuntu Security Notices (USN)

+ [USN-810-1](https://usn.ubuntu.com/USN-810-1)
+ NSS vulnerabilities
+ 4 August 2009

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2009-2408>