CVE-2009-2479

Mozilla Firefox 3.0.x, 3.5, 3.5.1 - Denial of Service via Long Unicode String to write Method

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2009-2479. PoCs published by Andrew Haynes.

AI-analyzed exploit summary This exploit targets a Unicode stack overflow vulnerability in Firefox 3.5 by generating a large string of Unicode characters to trigger a buffer overflow. The PoC uses JavaScript to create and concatenate strings to achieve the overflow condition.

Description

Mozilla Firefox 3.0.x, 3.5, and 3.5.1 on Windows allows remote attackers to cause a denial of service (uncaught exception and application crash) via a long Unicode string argument to the write method. NOTE: this was originally reported as a stack-based buffer overflow. NOTE: on Linux and Mac OS X, a crash resulting from this long string reportedly occurs in an operating-system library, not in Firefox.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Andrew Haynes · htmldoswindows
https://www.exploit-db.com/exploits/9158

This exploit targets a Unicode stack overflow vulnerability in Firefox 3.5 by generating a large string of Unicode characters to trigger a buffer overflow. The PoC uses JavaScript to create and concatenate strings to achieve the overflow condition.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Firefox 3.5
No auth needed
Prerequisites: Victim must visit a malicious webpage using Firefox 3.5
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (11)

Core 11
Core References
Various Sources x_refsource_misc
http://websecurity.com.ua/3338/
Issue Tracking x_refsource_confirm
https://bugzilla.mozilla.org/show_bug.cgi?id=504342
Vendor Advisory vendor-advisory x_refsource_fedora
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00909.html
Exploit, Third Party Advisory exploit x_refsource_exploit-db
http://www.exploit-db.com/exploits/9158
Third Party Advisory, VDB Entry mailing-list x_refsource_bugtraq
http://www.securityfocus.com/archive/1/505092/100/0/threaded
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id?1022580
Exploit vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/35707
Issue Tracking x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=504343
Third Party Advisory, VDB Entry vdb-entry x_refsource_osvdb
http://osvdb.org/55931
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/51729

Scores

EPSS 0.1209
EPSS Percentile 95.6%

Details

CWE
CWE-119
Status published
Products (19)
mozilla/firefox 3.0.1
mozilla/firefox 3.0.2
mozilla/firefox 3.0.3
mozilla/firefox 3.0.4
mozilla/firefox 3.0.5
mozilla/firefox 3.0.6
mozilla/firefox 3.0.7
mozilla/firefox 3.0.8
mozilla/firefox 3.0.9
mozilla/firefox 3.0.10
... and 9 more
Published Jul 16, 2009
Tracked Since Feb 18, 2026