CVE-2009-3978: n/a vulnerability

CVE-2009-3978: The nsGIFDecoder2::GifWrite function in decoders/gif/nsGIFDecoder2.cpp in libpr0n in Mozilla Firefox before...

The nsGIFDecoder2::GifWrite function in decoders/gif/nsGIFDecoder2.cpp in libpr0n in Mozilla Firefox before 3.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an animated GIF file with a large image size, a different vulnerability than CVE-2009-3373.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 17, 2024, 01:31 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2009-3978 is an old Firefox flaw where a specially crafted animated GIF with a very large image size could crash the browser. The public record describes denial of service only, not data theft or system takeover. Organizations are mainly exposed if they still run Firefox versions before 3.5.5. Exposure is limited to legacy Mozilla Firefox installations older than 3.5.5. Modern supported Firefox versions should not be considered affected based on the provided sources. Risk is highest where old browsers can render untrusted web or email content. Low priority for modern environments, but address promptly if legacy Firefox remains in production. The business risk is user disruption from browser crashes rather than confirmed compromise. Mitigation focus: Upgrade affected Firefox installations to 3.5.5 or later per Mozilla release references.; Remove unsupported legacy Firefox versions from managed environments.; Restrict legacy browsers from accessing untrusted web content until replaced..

Prepared: Jun 28, 2026, 17:10 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 19, 2009, 00:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://wiki.mozilla.org/Releases/Firefox_3.5.5/Test_PlanCVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=525326CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

CWE details

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