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Fencer Vulns
critical 10.0

CVE-2009-0771 json

The layout engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a den…

published 2009-03-05 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0771

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

The layout engine in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via certain vectors that trigger memory corruption and assertion failures.

Patch / fix

  • firefox RHEL 4 3.0.7-1.el4
  • firefox RHEL 5 3.0.7-1.el5
  • xulrunner RHEL 5 1.9.0.7-1.el5
  • xulrunner-devel-unstable RHEL 5 1.9.0.7-1.el5

red hat advisories RHSA-2009:0315

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-0771 updated cvss 6.8

Firefox 3 Layout Engine Crashes

  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.7-1.el5, xulrunner 1.9.0.7-1.el5, xulrunner-devel-unstable 1.9.0.7-1.el5 Red Hat Enterprise Linux AS version 4 firefox 3.0.7-1.el4 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.7-1.el5, xulrunner 1.9.0.7-1.el5, xulrunner-devel-unstable 1.9.0.7-1.el5 Red Hat Enterprise Linux Desktop version 4 firefox 3.0.7-1.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.7-1.el5, xulrunner-devel-unstable 1.9.0.7-1.el5 Red Hat Enterprise Linux ES version 4 firefox 3.0.7-1.el4
    +1 more products
    Red Hat Enterprise Linux WS version 4 firefox 3.0.7-1.el4
    fixed: vendor fix RHSA-2009:0315

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.61% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.