Skip to content
Fencer Vulns
medium 5.9

CVE-2009-2408 json

Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do n…

published 2009-07-30 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2404

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.7%
EPSS 5.7% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.

Patch / fix

  • mozilla firefox 3.0.13
  • mozilla network_security_services 3.12.3
  • mozilla seamonkey 1.1.18
  • mozilla thunderbird 2.0.0.23
  • nss Debian 14, Debian 13, Debian 12 3.12.3-1

debian advisories DEBIAN-CVE-2009-2408

  • seamonkey RHEL 3 1.0.9-0.45.el3
  • seamonkey-nss RHEL 3 1.0.9-0.45.el3
  • seamonkey-chat RHEL 3 1.0.9-0.45.el3
  • seamonkey-mail RHEL 3 1.0.9-0.45.el3
  • seamonkey-nspr RHEL 3 1.0.9-0.45.el3
  • seamonkey-js-debugger RHEL 3 1.0.9-0.45.el3
  • seamonkey-dom-inspector RHEL 3 1.0.9-0.45.el3
  • nss RHEL 5 3.12.3.99.3-1.el5_3.2

red hat advisories RHSA-2009:1432RHSA-2009:1207RHSA-2009:1190RHSA-2009:1186RHSA-2009:1184

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-2009-2408 updated cvss 4.3

firefox/nss: doesn't handle NULL in Common Name properly

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.45.el3, seamonkey-nss 1.0.9-0.45.el3, seamonkey-chat 1.0.9-0.45.el3, seamonkey-mail 1.0.9-0.45.el3, seamonkey-nspr 1.0.9-0.45.el3, seamonkey-js-debugger 1.0.9-0.45.el3, +1 more
    fixed: vendor fix RHSA-2009:1432
  • Red Hat Enterprise Linux (v. 5 server) nspr 4.7.4-1.el5_3.1, nss 3.12.3.99.3-1.el5_3.2, nss-tools 3.12.3.99.3-1.el5_3.2
    fixed: vendor fix RHSA-2009:1186
  • Red Hat Enterprise Linux AS EUS (v. 4.7) nspr 4.7.4-1.el4_7.1, nss 3.12.3.99.3-1.el4_7.6
    fixed: vendor fix RHSA-2009:1190
  • Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.45.el3, seamonkey-nss 1.0.9-0.45.el3, seamonkey-chat 1.0.9-0.45.el3, seamonkey-mail 1.0.9-0.45.el3, seamonkey-nspr 1.0.9-0.45.el3, seamonkey-js-debugger 1.0.9-0.45.el3, +1 more
    fixed: vendor fix RHSA-2009:1432
  • Red Hat Enterprise Linux AS version 4 nspr 4.7.4-1.el4_8.1, nss 3.12.3.99.3-1.el4_8.2, nss-tools 3.12.3.99.3-1.el4_8.2
    fixed: vendor fix RHSA-2009:1184
  • Red Hat Enterprise Linux Desktop (v. 5 client) nspr 4.7.4-1.el5_3.1, nss 3.12.3.99.3-1.el5_3.2, nss-tools 3.12.3.99.3-1.el5_3.2
    fixed: vendor fix RHSA-2009:1186
  • Red Hat Enterprise Linux Desktop version 4 nspr 4.7.4-1.el4_8.1, nss 3.12.3.99.3-1.el4_8.2, nss-tools 3.12.3.99.3-1.el4_8.2
    fixed: vendor fix RHSA-2009:1184
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nspr 4.7.4-1.el5_3.1, nss 3.12.3.99.3-1.el5_3.2, nss-tools 3.12.3.99.3-1.el5_3.2
    fixed: vendor fix RHSA-2009:1186
show 6 more
  • Red Hat Enterprise Linux ES EUS (v. 4.7) nspr 4.7.4-1.el4_7.1, nss 3.12.3.99.3-1.el4_7.6
    fixed: vendor fix RHSA-2009:1190
  • Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.45.el3, seamonkey-nss 1.0.9-0.45.el3, seamonkey-chat 1.0.9-0.45.el3, seamonkey-mail 1.0.9-0.45.el3, seamonkey-nspr 1.0.9-0.45.el3, seamonkey-js-debugger 1.0.9-0.45.el3, +1 more
    fixed: vendor fix RHSA-2009:1432
  • Red Hat Enterprise Linux ES version 4 nspr 4.7.4-1.el4_8.1, nss 3.12.3.99.3-1.el4_8.2, nss-tools 3.12.3.99.3-1.el4_8.2
    fixed: vendor fix RHSA-2009:1184
  • Red Hat Enterprise Linux EUS (v. 5.2 server) nspr 4.7.4-1.el5_2, nss 3.12.3.99.3-1.el5_2, nss-tools 3.12.3.99.3-1.el5_2
    fixed: vendor fix RHSA-2009:1207
  • Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.45.el3, seamonkey-nss 1.0.9-0.45.el3, seamonkey-chat 1.0.9-0.45.el3, seamonkey-mail 1.0.9-0.45.el3, seamonkey-nspr 1.0.9-0.45.el3, seamonkey-js-debugger 1.0.9-0.45.el3, +1 more
    fixed: vendor fix RHSA-2009:1432
  • Red Hat Enterprise Linux WS version 4 nspr 4.7.4-1.el4_8.1, nss 3.12.3.99.3-1.el4_8.2, nss-tools 3.12.3.99.3-1.el4_8.2
    fixed: vendor fix RHSA-2009:1184

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

5.74% 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 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-295 Improper Certificate 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.