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Fencer Vulns
medium 6.8

CVE-2009-3983 json

Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to send authenticated requests to…

published 2009-12-17 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3954

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to send authenticated requests to arbitrary applications by replaying the NTLM credentials of a browser user.

Patch / fix

  • firefox RHEL 4 3.0.16-4.el4
  • firefox RHEL 5 3.0.16-1.el5_4
  • xulrunner RHEL 5 1.9.0.16-2.el5_4
  • xulrunner-devel-unstable RHEL 5 1.9.0.16-2.el5_4
  • seamonkey RHEL 3 1.0.9-0.48.el3
  • seamonkey RHEL 4 1.0.9-51.el4_8
  • seamonkey-nss RHEL 3 1.0.9-0.48.el3
  • seamonkey-chat RHEL 3 1.0.9-0.48.el3

red hat advisories RHSA-2009:1674RHSA-2009:1673

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

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

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-2009-3983 updated cvss 4.3

Mozilla NTLM reflection vulnerability

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.48.el3, seamonkey-nss 1.0.9-0.48.el3, seamonkey-chat 1.0.9-0.48.el3, seamonkey-mail 1.0.9-0.48.el3, seamonkey-nspr 1.0.9-0.48.el3, seamonkey-js-debugger 1.0.9-0.48.el3, +1 more
    fixed: vendor fix RHSA-2009:1673
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.16-1.el5_4, xulrunner 1.9.0.16-2.el5_4, xulrunner-devel-unstable 1.9.0.16-2.el5_4
    fixed: vendor fix RHSA-2009:1674
  • Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.48.el3, seamonkey-nss 1.0.9-0.48.el3, seamonkey-chat 1.0.9-0.48.el3, seamonkey-mail 1.0.9-0.48.el3, seamonkey-nspr 1.0.9-0.48.el3, seamonkey-js-debugger 1.0.9-0.48.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.0.16-4.el4, seamonkey 1.0.9-51.el4_8, seamonkey-chat 1.0.9-51.el4_8, seamonkey-mail 1.0.9-51.el4_8, seamonkey-js-debugger 1.0.9-51.el4_8, seamonkey-dom-inspector 1.0.9-51.el4_8
    fixed: vendor fix RHSA-2009:1673
  • Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.16-1.el5_4, xulrunner 1.9.0.16-2.el5_4, xulrunner-devel-unstable 1.9.0.16-2.el5_4
    fixed: vendor fix RHSA-2009:1674
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.0.16-4.el4, seamonkey 1.0.9-51.el4_8, seamonkey-chat 1.0.9-51.el4_8, seamonkey-mail 1.0.9-51.el4_8, seamonkey-js-debugger 1.0.9-51.el4_8, seamonkey-dom-inspector 1.0.9-51.el4_8
    fixed: vendor fix RHSA-2009:1673
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.16-2.el5_4, xulrunner-devel-unstable 1.9.0.16-2.el5_4
    fixed: vendor fix RHSA-2009:1674
  • Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.48.el3, seamonkey-nss 1.0.9-0.48.el3, seamonkey-chat 1.0.9-0.48.el3, seamonkey-mail 1.0.9-0.48.el3, seamonkey-nspr 1.0.9-0.48.el3, seamonkey-js-debugger 1.0.9-0.48.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.0.16-4.el4, seamonkey 1.0.9-51.el4_8, seamonkey-chat 1.0.9-51.el4_8, seamonkey-mail 1.0.9-51.el4_8, seamonkey-js-debugger 1.0.9-51.el4_8, seamonkey-dom-inspector 1.0.9-51.el4_8 Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.48.el3, seamonkey-nss 1.0.9-0.48.el3, seamonkey-chat 1.0.9-0.48.el3, seamonkey-mail 1.0.9-0.48.el3, seamonkey-nspr 1.0.9-0.48.el3, seamonkey-js-debugger 1.0.9-0.48.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.0.16-4.el4, seamonkey 1.0.9-51.el4_8, seamonkey-chat 1.0.9-51.el4_8, seamonkey-mail 1.0.9-51.el4_8, seamonkey-js-debugger 1.0.9-51.el4_8, seamonkey-dom-inspector 1.0.9-51.el4_8
    fixed: vendor fix RHSA-2009:1673

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

2.20% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/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.