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Fencer Vulns
critical 10.0

CVE-2009-0773 json

The JavaScript 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…

published 2009-03-05 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0773

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.8%
EPSS 5.8% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

The JavaScript 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 (1) a splice of an array that contains "some non-set elements," which causes jsarray.cpp to pass an incorrect argument to the ResizeSlots function, which triggers memory corruption; (2) vectors related to js_DecompileValueGenerator, jsopcode.cpp, __defineSetter__, and watch, which triggers an assertion failure or a segmentation fault; and (3) vectors related to gczeal, __defineSetter__, and watch, which triggers a hang.

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-2009-0773 updated cvss 6.8

Firefox 3 crashes in the JavaScript engine

  • 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

5.79% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=467499 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=457521 referenced PoC, tagged "exploit" by a source, unverified

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.