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Fencer Vulns
critical 10.0

CVE-2008-5014 json

jslock.cpp in Mozilla Firefox 3.x before 3.0.2, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.…

published 2008-11-13 17 y ago modified 2026-06-16 4 mo ago also EUVD-2008-4993

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.9%
EPSS 5.9% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

jslock.cpp in Mozilla Firefox 3.x before 3.0.2, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code by modifying the window.__proto__.__proto__ object in a way that causes a lock on a non-native object, which triggers an assertion failure related to the OBJ_IS_NATIVE function.

Patch / fix

  • mozilla firefox 2.0.0.18, 3.0.2
  • mozilla seamonkey 1.1.13
  • mozilla thunderbird 2.0.0.18
  • firefox RHEL 4 3.0.4-1.el4
  • firefox RHEL 5 3.0.4-1.el5
  • nss RHEL 4 3.12.1.1-3.el4
  • nss RHEL 5 3.12.1.1-3.el5
  • yelp RHEL 5 2.16.0-22.el5
  • devhelp RHEL 5 0.12-20.el5
  • nss-tools RHEL 5 3.12.1.1-3.el5
  • xulrunner RHEL 5 1.9.0.4-1.el5

red hat advisories RHSA-2008:0978RHSA-2008:0977RHSA-2008:0976

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1

opensuse advisories openSUSE-SU-2024:10601-1

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-2008-5014 updated

Mozilla crash and remote code execution via __proto__ tampering

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.25.el3, seamonkey-nss 1.0.9-0.25.el3, seamonkey-chat 1.0.9-0.25.el3, seamonkey-mail 1.0.9-0.25.el3, seamonkey-nspr 1.0.9-0.25.el3, seamonkey-js-debugger 1.0.9-0.25.el3, +1 more
    fixed: vendor fix RHSA-2008:0977
  • Red Hat Enterprise Linux (v. 5 server) nss 3.12.1.1-3.el5, yelp 2.16.0-22.el5, devhelp 0.12-20.el5, firefox 3.0.4-1.el5, xulrunner 1.9.0.4-1.el5, nss-tools 3.12.1.1-3.el5, +1 more
    fixed: vendor fix RHSA-2008:0978
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.9-0.21.el2, seamonkey-nss 1.0.9-0.21.el2, seamonkey-chat 1.0.9-0.21.el2, seamonkey-mail 1.0.9-0.21.el2, seamonkey-nspr 1.0.9-0.21.el2, seamonkey-js-debugger 1.0.9-0.21.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.25.el3, seamonkey-nss 1.0.9-0.25.el3, seamonkey-chat 1.0.9-0.25.el3, seamonkey-mail 1.0.9-0.25.el3, seamonkey-nspr 1.0.9-0.25.el3, seamonkey-js-debugger 1.0.9-0.25.el3, +1 more Red Hat Enterprise Linux AS version 4 nss 3.12.1.1-3.el4, firefox 3.0.4-1.el4, seamonkey 1.0.9-28.el4, seamonkey-chat 1.0.9-28.el4, seamonkey-mail 1.0.9-28.el4, thunderbird 1.5.0.12-17.el4, +2 more
    fixed: vendor fix RHSA-2008:0977
  • Red Hat Enterprise Linux Desktop (v. 5 client) nss 3.12.1.1-3.el5, yelp 2.16.0-22.el5, devhelp 0.12-20.el5, firefox 3.0.4-1.el5, xulrunner 1.9.0.4-1.el5, nss-tools 3.12.1.1-3.el5, +2 more
    fixed: vendor fix RHSA-2008:0978
  • Red Hat Enterprise Linux Desktop version 4 nss 3.12.1.1-3.el4, firefox 3.0.4-1.el4, seamonkey 1.0.9-28.el4, seamonkey-chat 1.0.9-28.el4, seamonkey-mail 1.0.9-28.el4, thunderbird 1.5.0.12-17.el4, +2 more
    fixed: vendor fix RHSA-2008:0977
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nss 3.12.1.1-3.el5, devhelp 0.12-20.el5, xulrunner 1.9.0.4-1.el5, nss-tools 3.12.1.1-3.el5, xulrunner-devel-unstable 1.9.0.4-1.el5
    fixed: vendor fix RHSA-2008:0978
  • Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.9-0.21.el2, seamonkey-nss 1.0.9-0.21.el2, seamonkey-chat 1.0.9-0.21.el2, seamonkey-mail 1.0.9-0.21.el2, seamonkey-nspr 1.0.9-0.21.el2, seamonkey-js-debugger 1.0.9-0.21.el2, +1 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.25.el3, seamonkey-nss 1.0.9-0.25.el3, seamonkey-chat 1.0.9-0.25.el3, seamonkey-mail 1.0.9-0.25.el3, seamonkey-nspr 1.0.9-0.25.el3, seamonkey-js-debugger 1.0.9-0.25.el3, +1 more Red Hat Enterprise Linux ES version 4 nss 3.12.1.1-3.el4, firefox 3.0.4-1.el4, seamonkey 1.0.9-28.el4, seamonkey-chat 1.0.9-28.el4, seamonkey-mail 1.0.9-28.el4, thunderbird 1.5.0.12-17.el4, +2 more
    fixed: vendor fix RHSA-2008:0977
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.18-1.el5
    fixed: vendor fix RHSA-2008:0976
show 1 more
  • Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.9-0.21.el2, seamonkey-nss 1.0.9-0.21.el2, seamonkey-chat 1.0.9-0.21.el2, seamonkey-mail 1.0.9-0.21.el2, seamonkey-nspr 1.0.9-0.21.el2, seamonkey-js-debugger 1.0.9-0.21.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.25.el3, seamonkey-nss 1.0.9-0.25.el3, seamonkey-chat 1.0.9-0.25.el3, seamonkey-mail 1.0.9-0.25.el3, seamonkey-nspr 1.0.9-0.25.el3, seamonkey-js-debugger 1.0.9-0.25.el3, +1 more Red Hat Enterprise Linux WS version 4 nss 3.12.1.1-3.el4, firefox 3.0.4-1.el4, seamonkey 1.0.9-28.el4, seamonkey-chat 1.0.9-28.el4, seamonkey-mail 1.0.9-28.el4, thunderbird 1.5.0.12-17.el4, +2 more Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.9-0.21.el2, seamonkey-nss 1.0.9-0.21.el2, seamonkey-chat 1.0.9-0.21.el2, seamonkey-mail 1.0.9-0.21.el2, seamonkey-nspr 1.0.9-0.21.el2, seamonkey-js-debugger 1.0.9-0.21.el2, +1 more
    fixed: vendor fix RHSA-2008:0977

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

5.87% chance of exploitation in the next 30 days, higher than 93% 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-20 Improper Input Validation

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.