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CVE-2009-3978

16
FAUCET Score

CVE-2009-3978 is a denial-of-service vulnerability affecting Mozilla Firefox versions prior to 3.5.5. It allows remote attackers to crash the application via a NULL pointer dereference by providing a specially crafted animated GIF with a large image size. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and a partial impact on availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.5.4CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.79%
Probability of exploitation in next 30 days
EPSS Percentile
76.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0179 is in the 55th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Advisories (1)

redhatCVE-2009-3978

Seamonkey: NULL pointer dereference in GIF decoder

Oct 29, 2009

References

hg.mozilla.org / releases/mozilla-1.9.1/rev/edf189567edc
bugzilla.mozilla.org / show_bug.cgi
wiki.mozilla.org / Releases/Firefox_3.5.5/Test_Plan
Patch
h-online.com / open/news/item/Mozilla-fixes-critical-bugs-with-Firefox-3-5-5-852070.html
Patch
mozilla.com / en-US/firefox/3.5.5/releasenotes
Patch