How severe is CVE-2009-4634?

CVE-2009-4634 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-4634 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4634?

CVE-2009-4634 affects Ffmpeg. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4634?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-4634 published?

CVE-2009-4634 was published on 2010-02-10 and last updated on 2026-06-16.

CVE-2009-4634

CVE-2009-4634 is a critical-severity vulnerability in Ffmpeg with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Ffmpeg
Published: 2010-02-10
Last modified: 2026-06-16

Description

Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a crafted file that (1) bypasses a validation check in vorbis_dec.c and triggers a wraparound of the stack pointer, or (2) access a pointer from out-of-bounds memory in mov.c, related to an elst tag that appears before a tag that creates a stream.

Frequently asked questions

What is CVE-2009-4634?: Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a crafted file that (1) bypasses a validation check in vorbis_dec.c and triggers a wraparound of the stack pointer, or (2) access a pointer from out-of-bounds memory in mov.c, related to an elst tag that appears before a tag that creates a stream.
How severe is CVE-2009-4634?: CVE-2009-4634 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-4634 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4634?: CVE-2009-4634 affects Ffmpeg. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4634?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-4634 published?: CVE-2009-4634 was published on 2010-02-10 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:ffmpeg:ffmpeg:0.5:*:*:*:*:*:*:*

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All CVEs affecting Ffmpeg →

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