How severe is CVE-2009-4639?

CVE-2009-4639 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-4639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4639?

CVE-2009-4639 affects Ffmpeg. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4639?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-4639 published?

CVE-2009-4639 was published on 2010-02-10 and last updated on 2026-06-16.

CVE-2009-4639

CVE-2009-4639 is a medium-severity vulnerability in Ffmpeg with a CVSS 2.0 base score of 4.3. 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: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Ffmpeg
Published: 2010-02-10
Last modified: 2026-06-16

Description

The av_rescale_rnd function in the AVI demuxer in FFmpeg 0.5 allows remote attackers to cause a denial of service (crash) via a crafted AVI file that triggers a divide-by-zero error.

Frequently asked questions

What is CVE-2009-4639?: The av_rescale_rnd function in the AVI demuxer in FFmpeg 0.5 allows remote attackers to cause a denial of service (crash) via a crafted AVI file that triggers a divide-by-zero error.
How severe is CVE-2009-4639?: CVE-2009-4639 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-4639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4639?: CVE-2009-4639 affects Ffmpeg. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4639 published?: CVE-2009-4639 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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