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CVE-2009-0771

26
FAUCET Score

CVE-2009-0771 describes a critical denial-of-service and potential arbitrary code execution vulnerability in the layout engine of Mozilla Firefox (before 3.0.7), Thunderbird (before 2.0.0.21), and SeaMonkey (1.1.15). This vulnerability, stemming from memory corruption and assertion failures, carries a CVSS score of 10.0, indicating a severe risk with network-based exploitation requiring low attack complexity and leading to complete confidentiality, integrity, and availability compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this decade-old vulnerability.

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
4.61%
Probability of exploitation in next 30 days
EPSS Percentile
90.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0461 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 (3)

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 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-2009-0771Critical

Firefox 3 Layout Engine Crashes

Mar 4, 2009

References

lists.opensuse.org / opensuse-security-announce/2009-03/msg00002.html
bugzilla.mozilla.org / buglist.cgi
secunia.com / advisories/34140
secunia.com / advisories/34145
secunia.com / advisories/34272
secunia.com / advisories/34383
secunia.com / advisories/34462
secunia.com / advisories/34464
secunia.com / advisories/34527
slackware.com / security/viewer.php
slackware.com / security/viewer.php
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11314
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5250
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6163
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6196
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6755
support.avaya.com / elmodocs2/security/ASA-2009-069.htm
support.avaya.com / japple/css/japple
redhat.com / archives/fedora-package-announce/2009-March/msg01077.html
debian.org / security/2009/dsa-1751
debian.org / security/2009/dsa-1830
mandriva.com / security/advisories
mandriva.com / security/advisories
mozilla.org / security/announce/2009/mfsa2009-07.html
redhat.com / support/errata/RHSA-2009-0315.html
securityfocus.com / bid/33990
securitytracker.com / id
vupen.com / english/advisories/2009/0632