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Fencer Vulns
critical 10.0

CVE-2009-2463 json

Multiple integer overflows in the (1) PL_Base64Decode and (2) PL_Base64Encode functions in nsprpub/lib/libc/src/base64.c in Mozilla Firefox…

published 2009-07-22 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2458

cvss
10.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.4%
EPSS 6.4% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Multiple integer overflows in the (1) PL_Base64Decode and (2) PL_Base64Encode functions in nsprpub/lib/libc/src/base64.c in Mozilla Firefox before 3.0.12, Thunderbird before 2.0.0.24, and SeaMonkey before 1.1.19 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors that trigger buffer overflows.

Patch / fix

  • nspr Debian 14, Debian 13, Debian 12 4.8.2-1

debian advisories DEBIAN-CVE-2009-2463

  • thunderbird RHEL 4 1.5.0.12-25.el4
  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.24-2.el5_4
  • seamonkey RHEL 3 1.0.9-0.40.el3
  • seamonkey RHEL 4 1.0.9-45.el4_8
  • seamonkey-nss RHEL 3 1.0.9-0.40.el3
  • seamonkey-chat RHEL 3 1.0.9-0.40.el3
  • seamonkey-chat RHEL 4 1.0.9-45.el4_8
  • seamonkey-mail RHEL 3 1.0.9-0.40.el3

red hat advisories RHSA-2010:0154RHSA-2010:0153RHSA-2009:1163RHSA-2009:1162

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-2009-2463 updated cvss 6.8

Mozilla Base64 decoding crash

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.40.el3, seamonkey-nss 1.0.9-0.40.el3, seamonkey-chat 1.0.9-0.40.el3, seamonkey-mail 1.0.9-0.40.el3, seamonkey-nspr 1.0.9-0.40.el3, seamonkey-js-debugger 1.0.9-0.40.el3, +1 more
    fixed: vendor fix RHSA-2009:1163
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.12-1.el5_3, xulrunner 1.9.0.12-1.el5_3, xulrunner-devel-unstable 1.9.0.12-1.el5_3
    fixed: vendor fix RHSA-2009:1162
  • Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.40.el3, seamonkey-nss 1.0.9-0.40.el3, seamonkey-chat 1.0.9-0.40.el3, seamonkey-mail 1.0.9-0.40.el3, seamonkey-nspr 1.0.9-0.40.el3, seamonkey-js-debugger 1.0.9-0.40.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.0.12-1.el4, seamonkey 1.0.9-45.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-45.el4_8, seamonkey-mail 1.0.9-45.el4_8, seamonkey-js-debugger 1.0.9-45.el4_8, +1 more
    fixed: vendor fix RHSA-2009:1163
  • Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.12-1.el5_3, xulrunner 1.9.0.12-1.el5_3, thunderbird 2.0.0.24-2.el5_4, xulrunner-devel-unstable 1.9.0.12-1.el5_3
    fixed: vendor fix RHSA-2009:1162
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.0.12-1.el4, seamonkey 1.0.9-45.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-45.el4_8, seamonkey-mail 1.0.9-45.el4_8, seamonkey-js-debugger 1.0.9-45.el4_8, +1 more
    fixed: vendor fix RHSA-2009:1163
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.12-1.el5_3, xulrunner-devel-unstable 1.9.0.12-1.el5_3
    fixed: vendor fix RHSA-2009:1162
  • Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.40.el3, seamonkey-nss 1.0.9-0.40.el3, seamonkey-chat 1.0.9-0.40.el3, seamonkey-mail 1.0.9-0.40.el3, seamonkey-nspr 1.0.9-0.40.el3, seamonkey-js-debugger 1.0.9-0.40.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.0.12-1.el4, seamonkey 1.0.9-45.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-45.el4_8, seamonkey-mail 1.0.9-45.el4_8, seamonkey-js-debugger 1.0.9-45.el4_8, +1 more
    fixed: vendor fix RHSA-2009:1163
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.24-2.el5_4
    fixed: vendor fix RHSA-2010:0153
show 1 more
  • Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.40.el3, seamonkey-nss 1.0.9-0.40.el3, seamonkey-chat 1.0.9-0.40.el3, seamonkey-mail 1.0.9-0.40.el3, seamonkey-nspr 1.0.9-0.40.el3, seamonkey-js-debugger 1.0.9-0.40.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.0.12-1.el4, seamonkey 1.0.9-45.el4_8, thunderbird 1.5.0.12-25.el4, seamonkey-chat 1.0.9-45.el4_8, seamonkey-mail 1.0.9-45.el4_8, seamonkey-js-debugger 1.0.9-45.el4_8, +1 more
    fixed: vendor fix RHSA-2009:1163

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

6.43% 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

References

Sources

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