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Fencer Vulns
medium 4.3

CVE-2008-4066 json

Mozilla Firefox 2.0.0.14, and other versions before 2.0.0.17, allows remote attackers to bypass cross-site scripting (XSS) protection mecha…

published 2008-09-24 18 y ago modified 2026-06-16 4 mo ago also EUVD-2008-4051

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

Mozilla Firefox 2.0.0.14, and other versions before 2.0.0.17, allows remote attackers to bypass cross-site scripting (XSS) protection mechanisms and conduct XSS attacks via HTML-escaped low surrogate characters that are ignored by the HTML parser, as demonstrated by a "jav&#56325ascript" sequence, aka "HTML escaped low surrogates bug."

Patch / fix

  • thunderbird RHEL 4 1.5.0.12-16.el4
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.17-1.el5
  • seamonkey RHEL 2.1 1.0.9-0.20.el2
  • seamonkey RHEL 3 1.0.9-0.24.el3
  • seamonkey RHEL 4 1.0.9-26.el4
  • devhelp RHEL 4 0.10-0.10.el4
  • seamonkey-nss RHEL 2.1 1.0.9-0.20.el2
  • seamonkey-nss RHEL 3 1.0.9-0.24.el3

red hat advisories RHSA-2008:0908RHSA-2008:0882

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-2008-4066 updated

Mozilla low surrogates stripped from JavaScript before execution

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.24.el3, seamonkey-nss 1.0.9-0.24.el3, seamonkey-chat 1.0.9-0.24.el3, seamonkey-mail 1.0.9-0.24.el3, seamonkey-nspr 1.0.9-0.24.el3, seamonkey-js-debugger 1.0.9-0.24.el3, +1 more Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.9-0.20.el2, seamonkey-nss 1.0.9-0.20.el2, seamonkey-chat 1.0.9-0.20.el2, seamonkey-mail 1.0.9-0.20.el2, seamonkey-nspr 1.0.9-0.20.el2, seamonkey-js-debugger 1.0.9-0.20.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.24.el3, seamonkey-nss 1.0.9-0.24.el3, seamonkey-chat 1.0.9-0.24.el3, seamonkey-mail 1.0.9-0.24.el3, seamonkey-nspr 1.0.9-0.24.el3, seamonkey-js-debugger 1.0.9-0.24.el3, +1 more Red Hat Enterprise Linux AS version 4 devhelp 0.10-0.10.el4, seamonkey 1.0.9-26.el4, seamonkey-chat 1.0.9-26.el4, seamonkey-mail 1.0.9-26.el4, thunderbird 1.5.0.12-16.el4, seamonkey-js-debugger 1.0.9-26.el4, +1 more
    fixed: vendor fix RHSA-2008:0882
  • Red Hat Enterprise Linux Desktop (v. 5 client) thunderbird 2.0.0.17-1.el5
    fixed: vendor fix RHSA-2008:0908
  • Red Hat Enterprise Linux Desktop version 4 devhelp 0.10-0.10.el4, seamonkey 1.0.9-26.el4, seamonkey-chat 1.0.9-26.el4, seamonkey-mail 1.0.9-26.el4, thunderbird 1.5.0.12-16.el4, seamonkey-js-debugger 1.0.9-26.el4, +1 more Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.9-0.20.el2, seamonkey-nss 1.0.9-0.20.el2, seamonkey-chat 1.0.9-0.20.el2, seamonkey-mail 1.0.9-0.20.el2, seamonkey-nspr 1.0.9-0.20.el2, seamonkey-js-debugger 1.0.9-0.20.el2, +1 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.24.el3, seamonkey-nss 1.0.9-0.24.el3, seamonkey-chat 1.0.9-0.24.el3, seamonkey-mail 1.0.9-0.24.el3, seamonkey-nspr 1.0.9-0.24.el3, seamonkey-js-debugger 1.0.9-0.24.el3, +1 more Red Hat Enterprise Linux ES version 4 devhelp 0.10-0.10.el4, seamonkey 1.0.9-26.el4, seamonkey-chat 1.0.9-26.el4, seamonkey-mail 1.0.9-26.el4, thunderbird 1.5.0.12-16.el4, seamonkey-js-debugger 1.0.9-26.el4, +1 more
    fixed: vendor fix RHSA-2008:0882
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.17-1.el5
    fixed: vendor fix RHSA-2008:0908
  • Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.9-0.20.el2, seamonkey-nss 1.0.9-0.20.el2, seamonkey-chat 1.0.9-0.20.el2, seamonkey-mail 1.0.9-0.20.el2, seamonkey-nspr 1.0.9-0.20.el2, seamonkey-js-debugger 1.0.9-0.20.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.24.el3, seamonkey-nss 1.0.9-0.24.el3, seamonkey-chat 1.0.9-0.24.el3, seamonkey-mail 1.0.9-0.24.el3, seamonkey-nspr 1.0.9-0.24.el3, seamonkey-js-debugger 1.0.9-0.24.el3, +1 more Red Hat Enterprise Linux WS version 4 devhelp 0.10-0.10.el4, seamonkey 1.0.9-26.el4, seamonkey-chat 1.0.9-26.el4, seamonkey-mail 1.0.9-26.el4, thunderbird 1.5.0.12-16.el4, seamonkey-js-debugger 1.0.9-26.el4, +1 more Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.9-0.20.el2, seamonkey-nss 1.0.9-0.20.el2, seamonkey-chat 1.0.9-0.20.el2, seamonkey-mail 1.0.9-0.20.el2, seamonkey-nspr 1.0.9-0.20.el2, seamonkey-js-debugger 1.0.9-0.20.el2, +1 more
    fixed: vendor fix RHSA-2008:0882

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

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • thespanner.co.uk http://www.thespanner.co.uk/2008/06/30/javascript-protocol-fuzz-results/ referenced PoC, tagged "exploit" by a source, unverified
  • blogs.technet.com http://blogs.technet.com/bluehat/archive/2008/08/14/targeted-fuzzing.aspx referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.