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CVE-2009-0775

26
FAUCET Score

CVE-2009-0775 describes a critical double free vulnerability affecting Mozilla Firefox, Thunderbird, and SeaMonkey versions prior to their respective patches. This flaw allows remote attackers to execute arbitrary code by manipulating XUL DOM elements during garbage collection. With a CVSS score of 10.0, it represents a severe risk, enabling complete compromise of confidentiality, integrity, and availability with low attack complexity and no authentication required. Despite its high severity, there is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.6CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0:*:*:*:*:*:*:*
1.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0.1:*:*:*:*:*:*:*
1.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0.2:*:*:*:*:*:*:*
1.0.3CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:1.0.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
4.71%
Probability of exploitation in next 30 days
EPSS Percentile
90.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0471 is in the 84th percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 2.1Fixed in: seamonkey-0:1.0.9-0.30.el2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: seamonkey-0:1.0.9-0.34.el3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: thunderbird-0:1.5.0.12-19.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.7-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: seamonkey-0:1.0.9-38.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:2.0.0.21-1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.7-1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.7-1.el5
View patch

Vendor Advisories (1)

redhatCVE-2009-0775Critical

Firefox XUL Linked Clones Double Free Vulnerability

Mar 4, 2009

References

lists.opensuse.org / opensuse-security-announce/2009-03/msg00002.html
bugzilla.mozilla.org / show_bug.cgi
secunia.com / advisories/34137
secunia.com / advisories/34140
secunia.com / advisories/34145
secunia.com / advisories/34272
secunia.com / advisories/34324
secunia.com / advisories/34383
secunia.com / advisories/34417
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5806
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5816
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6207
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7584
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9681
support.avaya.com / elmodocs2/security/ASA-2009-069.htm
support.avaya.com / japple/css/japple
redhat.com / archives/fedora-package-announce/2009-March/msg00769.html
redhat.com / archives/fedora-package-announce/2009-March/msg00771.html
debian.org / security/2009/dsa-1751
mandriva.com / security/advisories
mozilla.org / security/announce/2009/mfsa2009-08.html
redhat.com / support/errata/RHSA-2009-0258.html
redhat.com / support/errata/RHSA-2009-0315.html
redhat.com / support/errata/RHSA-2009-0325.html
securityfocus.com / bid/33990
securitytracker.com / id
vupen.com / english/advisories/2009/0632