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Fencer Vulns
medium 5.0

CVE-2008-5501 json

The layout engine in Mozilla Firefox 3.x before 3.0.5, Thunderbird 2.x before 2.0.0.19, and SeaMonkey 1.x before 1.1.14 allows remote attac…

published 2008-12-17 17 y ago modified 2026-06-16 4 mo ago also EUVD-2008-5478

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

The layout engine in Mozilla Firefox 3.x before 3.0.5, Thunderbird 2.x before 2.0.0.19, and SeaMonkey 1.x before 1.1.14 allows remote attackers to cause a denial of service via vectors that trigger an assertion failure.

Patch / fix

  • mozilla firefox 2.0.0.19, 3.0.5
  • mozilla seamonkey 1.1.14
  • thunderbird RHEL 4 1.5.0.12-18.el4
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.19-1.el5_2
  • seamonkey RHEL 2.1 1.0.9-0.25.el2
  • seamonkey RHEL 3 1.0.9-0.29.el3
  • seamonkey RHEL 4 1.0.9-32.el4
  • seamonkey-nss RHEL 2.1 1.0.9-0.25.el2
  • seamonkey-nss RHEL 3 1.0.9-0.29.el3
  • seamonkey-chat RHEL 2.1 1.0.9-0.25.el2

red hat advisories RHSA-2009:0002RHSA-2008:1037RHSA-2008:1036

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-2008-5501 updated

Layout engine crash - Firefox 3 only

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.29.el3, seamonkey-nss 1.0.9-0.29.el3, seamonkey-chat 1.0.9-0.29.el3, seamonkey-mail 1.0.9-0.29.el3, seamonkey-nspr 1.0.9-0.29.el3, seamonkey-js-debugger 1.0.9-0.29.el3, +1 more
    fixed: vendor fix RHSA-2008:1037
  • Red Hat Enterprise Linux (v. 5 server) nspr 4.7.3-2.el5, nss 3.12.2.0-2.el5, firefox 3.0.5-1.el5_2, nss-tools 3.12.2.0-2.el5, xulrunner 1.9.0.5-1.el5_2, xulrunner-devel-unstable 1.9.0.5-1.el5_2
    fixed: vendor fix RHSA-2008:1036
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.9-0.25.el2, seamonkey-nss 1.0.9-0.25.el2, seamonkey-chat 1.0.9-0.25.el2, seamonkey-mail 1.0.9-0.25.el2, seamonkey-nspr 1.0.9-0.25.el2, seamonkey-js-debugger 1.0.9-0.25.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.29.el3, seamonkey-nss 1.0.9-0.29.el3, seamonkey-chat 1.0.9-0.29.el3, seamonkey-mail 1.0.9-0.29.el3, seamonkey-nspr 1.0.9-0.29.el3, seamonkey-js-debugger 1.0.9-0.29.el3, +1 more Red Hat Enterprise Linux AS version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4, seamonkey 1.0.9-32.el4, seamonkey-chat 1.0.9-32.el4, seamonkey-mail 1.0.9-32.el4, +3 more
    fixed: vendor fix RHSA-2008:1037
  • Red Hat Enterprise Linux Desktop (v. 5 client) nspr 4.7.3-2.el5, nss 3.12.2.0-2.el5, firefox 3.0.5-1.el5_2, nss-tools 3.12.2.0-2.el5, xulrunner 1.9.0.5-1.el5_2, thunderbird 2.0.0.19-1.el5_2, +1 more
    fixed: vendor fix RHSA-2008:1036
  • Red Hat Enterprise Linux Desktop version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4, seamonkey 1.0.9-32.el4, seamonkey-chat 1.0.9-32.el4, seamonkey-mail 1.0.9-32.el4, +3 more
    fixed: vendor fix RHSA-2008:1037
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nspr 4.7.3-2.el5, nss 3.12.2.0-2.el5, nss-tools 3.12.2.0-2.el5, xulrunner 1.9.0.5-1.el5_2, xulrunner-devel-unstable 1.9.0.5-1.el5_2
    fixed: vendor fix RHSA-2008:1036
  • Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.9-0.25.el2, seamonkey-nss 1.0.9-0.25.el2, seamonkey-chat 1.0.9-0.25.el2, seamonkey-mail 1.0.9-0.25.el2, seamonkey-nspr 1.0.9-0.25.el2, seamonkey-js-debugger 1.0.9-0.25.el2, +1 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.29.el3, seamonkey-nss 1.0.9-0.29.el3, seamonkey-chat 1.0.9-0.29.el3, seamonkey-mail 1.0.9-0.29.el3, seamonkey-nspr 1.0.9-0.29.el3, seamonkey-js-debugger 1.0.9-0.29.el3, +1 more Red Hat Enterprise Linux ES version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4, seamonkey 1.0.9-32.el4, seamonkey-chat 1.0.9-32.el4, seamonkey-mail 1.0.9-32.el4, +3 more
    fixed: vendor fix RHSA-2008:1037
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.19-1.el5_2
    fixed: vendor fix RHSA-2009:0002
show 1 more
  • Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.9-0.25.el2, seamonkey-nss 1.0.9-0.25.el2, seamonkey-chat 1.0.9-0.25.el2, seamonkey-mail 1.0.9-0.25.el2, seamonkey-nspr 1.0.9-0.25.el2, seamonkey-js-debugger 1.0.9-0.25.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.29.el3, seamonkey-nss 1.0.9-0.29.el3, seamonkey-chat 1.0.9-0.29.el3, seamonkey-mail 1.0.9-0.29.el3, seamonkey-nspr 1.0.9-0.29.el3, seamonkey-js-debugger 1.0.9-0.29.el3, +1 more Red Hat Enterprise Linux WS version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4, seamonkey 1.0.9-32.el4, seamonkey-chat 1.0.9-32.el4, seamonkey-mail 1.0.9-32.el4, +3 more Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.9-0.25.el2, seamonkey-nss 1.0.9-0.25.el2, seamonkey-chat 1.0.9-0.25.el2, seamonkey-mail 1.0.9-0.25.el2, seamonkey-nspr 1.0.9-0.25.el2, seamonkey-js-debugger 1.0.9-0.25.el2, +1 more
    fixed: vendor fix RHSA-2008:1037

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

3.14% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

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.