CVE-2006-2723

Unspecified versions of Mozilla Firefox allow remote attackers to cause a denial of service ...

5.0 MediumPublic exploitFix available

Unspecified versions of Mozilla Firefox allow remote attackers to cause a denial of service (crash) via a web page that contains a large number of nested marquee tags. NOTE: a followup post indicated that the initial report could not be verified.

Exploit likelihood

3.00%Down 3.8 points since Feb 4, 2022

What each source reports

NVD Score used 5.0

Record: CVE-2006-2723
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

CVE List No score

Record: CVE-2006-2723
Updated: 2026-11-02

EUVDEUVD-2006-2722 No score

Record: EUVD-2006-2722
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7j2m-9286-4vwj No score

Unspecified versions of Mozilla Firefox allow remote attackers to cause a denial of service ...

Record: GHSA-7j2m-9286-4vwj
Updated: 2026-11-02

OSV No score

Record: CVE-2006-2723
Updated: 2026-11-02

OSVDEBIAN-CVE-2006-2723 No score

Record: DEBIAN-CVE-2006-2723
Updated: 2026-11-02

Affected products

mozilla firefox

Affected packages

Affected packages
Package	Affected	Fixed
`firefox-esr` Debian:12	before 45.0esr-1	45.0esr-1
`firefox-esr` Debian:13	before 45.0esr-1	45.0esr-1
`firefox-esr` Debian:14	before 45.0esr-1	45.0esr-1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	Mozilla Firefox 1.5.0.4 - 'marquee' Denial of Service	2006-06-02

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2006-2723 is a medium vulnerability (CVSS 5.0) in Mozilla Firefox, published June 1, 2006. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 3.00%, the 87th percentile. Fixed in firefox-esr 45.0esr-1.