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CVE-2009-2463

28
FAUCET Score

CVE-2009-2463 describes multiple integer overflows in the Base64 encoding/decoding functions within Mozilla Firefox, Thunderbird, and SeaMonkey. These flaws could be remotely triggered, leading to memory corruption, application crashes, or potentially arbitrary code execution. With a CVSS score of 10.0, this vulnerability is considered critical due to its network-based attack vector, low attack complexity, and complete impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, no public exploit code available (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.1:*:*:*:*:*:*:*
0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.2:*:*:*:*:*:*:*
0.3CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.3:*:*:*:*:*:*:*
0.4CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.4:*:*:*:*:*:*:*
0.5CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
6.43%
Probability of exploitation in next 30 days
EPSS Percentile
93.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0643 is in the 88th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:2.0.0.24-2.el5_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: seamonkey-0:1.0.9-0.40.el3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.12-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: seamonkey-0:1.0.9-45.el4_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: thunderbird-0:1.5.0.12-25.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.12-1.el5_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.12-1.el5_3
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2009-2463Critical

Mozilla Base64 decoding crash

Jul 21, 2009

References

lists.opensuse.org / opensuse-security-announce/2009-07/msg00005.html
lists.opensuse.org / opensuse-security-announce/2009-08/msg00002.html
lists.opensuse.org / opensuse-security-announce/2010-06/msg00001.html
rhn.redhat.com / errata/RHSA-2009-1162.html
rhn.redhat.com / errata/RHSA-2009-1163.html
bugzilla.mozilla.org / show_bug.cgi
Vendor Advisory
secunia.com / advisories/35914
Vendor Advisory
secunia.com / advisories/35943
Vendor Advisory
secunia.com / advisories/35944
Vendor Advisory
secunia.com / advisories/35947
Vendor Advisory
secunia.com / advisories/36005
secunia.com / advisories/36145
secunia.com / advisories/38977
secunia.com / advisories/39001
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10369
sunsolve.sun.com / search/document.do
sunsolve.sun.com / search/document.do
redhat.com / archives/fedora-package-announce/2009-July/msg01032.html
mozilla.org / security/announce/2009/mfsa2009-34.html
Vendor Advisory
mozilla.org / security/announce/2010/mfsa2010-07.html
redhat.com / support/errata/RHSA-2010-0153.html
redhat.com / support/errata/RHSA-2010-0154.html
securityfocus.com / bid/35758
Patch
ubuntu.com / usn/USN-915-1
vupen.com / english/advisories/2009/1972
PatchVendor Advisory
vupen.com / english/advisories/2009/2152
vupen.com / english/advisories/2010/0648
vupen.com / english/advisories/2010/0650