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Fencer Vulns
critical 9.3

CVE-2009-2404 json

Heap-based buffer overflow in a regular-expression parser in Mozilla Network Security Services (NSS) before 3.12.3, as used in Firefox, Thu…

published 2009-08-03 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2400

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

Heap-based buffer overflow in a regular-expression parser in Mozilla Network Security Services (NSS) before 3.12.3, as used in Firefox, Thunderbird, SeaMonkey, Evolution, Pidgin, and AOL Instant Messenger (AIM), allows remote SSL servers to cause a denial of service (application crash) or possibly execute arbitrary code via a long domain name in the subject's Common Name (CN) field of an X.509 certificate, related to the cert_TestHostName function.

Patch / fix

  • nss Debian 14, Debian 13, Debian 12 3.12.3-1

debian advisories DEBIAN-CVE-2009-2404

  • nss RHEL 5 3.12.3.99.3-1.el5_3.2
  • nspr RHEL 5 4.7.4-1.el5_3.1
  • nss-tools RHEL 5 3.12.3.99.3-1.el5_3.2
  • seamonkey RHEL 3 1.0.9-0.41.el3
  • seamonkey-nss RHEL 3 1.0.9-0.41.el3
  • seamonkey-chat RHEL 3 1.0.9-0.41.el3
  • seamonkey-mail RHEL 3 1.0.9-0.41.el3
  • seamonkey-nspr RHEL 3 1.0.9-0.41.el3

red hat advisories RHSA-2009:1207RHSA-2009:1190RHSA-2009:1186RHSA-2009:1185RHSA-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-2009-2404 updated cvss 6.8

nss regexp heap overflow

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.41.el3, seamonkey-nss 1.0.9-0.41.el3, seamonkey-chat 1.0.9-0.41.el3, seamonkey-mail 1.0.9-0.41.el3, seamonkey-nspr 1.0.9-0.41.el3, seamonkey-js-debugger 1.0.9-0.41.el3, +1 more
    fixed: vendor fix RHSA-2009:1185
  • 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 1.0.9-0.41.el3, seamonkey-nss 1.0.9-0.41.el3, seamonkey-chat 1.0.9-0.41.el3, seamonkey-mail 1.0.9-0.41.el3, seamonkey-nspr 1.0.9-0.41.el3, seamonkey-js-debugger 1.0.9-0.41.el3, +1 more
    fixed: vendor fix RHSA-2009:1185
  • 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 1.0.9-0.41.el3, seamonkey-nss 1.0.9-0.41.el3, seamonkey-chat 1.0.9-0.41.el3, seamonkey-mail 1.0.9-0.41.el3, seamonkey-nspr 1.0.9-0.41.el3, seamonkey-js-debugger 1.0.9-0.41.el3, +1 more
    fixed: vendor fix RHSA-2009:1185
  • 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 1.0.9-0.41.el3, seamonkey-nss 1.0.9-0.41.el3, seamonkey-chat 1.0.9-0.41.el3, seamonkey-mail 1.0.9-0.41.el3, seamonkey-nspr 1.0.9-0.41.el3, seamonkey-js-debugger 1.0.9-0.41.el3, +1 more
    fixed: vendor fix RHSA-2009:1185
  • 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

4.15% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.