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Vulnerability record · CVE-2009-2479 · published 16 July 2009

CVE-2009-2479: Mozilla firefox memory buffer overflow vulnerability

Mozilla · Firefox

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.

7.8 CVSS 2.0 High EPSS 12% · top 4.0% CWE-119 · Memory buffer overflow
7.8CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
22References, 2 tagged exploit
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://blog.mozilla.com/security/2009/07/19/milw0rm-9158-stack-overflow-crash-not-exploitable-cve-2009-2479/
http://osvdb.org/55931
http://websecurity.com.ua/3338/
http://www.exploit-db.com/exploits/9158
http://www.securityfocus.com/archive/1/505092/100/0/threaded
http://www.securityfocus.com/bid/35707 Exploit
http://www.securitytracker.com/id?1022580
https://bugzilla.mozilla.org/show_bug.cgi?id=504342
https://bugzilla.mozilla.org/show_bug.cgi?id=504343
https://exchange.xforce.ibmcloud.com/vulnerabilities/51729
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00909.html
http://blog.mozilla.com/security/2009/07/19/milw0rm-9158-stack-overflow-crash-not-exploitable-cve-2009-2479/
http://osvdb.org/55931
http://websecurity.com.ua/3338/
http://www.exploit-db.com/exploits/9158
http://www.securityfocus.com/archive/1/505092/100/0/threaded
http://www.securityfocus.com/bid/35707 Exploit
http://www.securitytracker.com/id?1022580
https://bugzilla.mozilla.org/show_bug.cgi?id=504342
https://bugzilla.mozilla.org/show_bug.cgi?id=504343
https://exchange.xforce.ibmcloud.com/vulnerabilities/51729
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00909.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-2479), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.