CVE-2009-4635

CVE-2009-4635 is a critical-severity vulnerability in Ffmpeg with a CVSS 2.0 base score of 9.3. 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-94.

Key facts

• Severity: Critical (CVSS 2.0 base score 9.3)
• EPSS exploit prediction: 8% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-94
• Affected product: Ffmpeg
• Published: 2010-02-10
• Last modified: 2026-06-16

Description

FFmpeg 0.5 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a crafted MOV container with improperly ordered tags that cause (1) mov.c and (2) utils.c to use inconsistent codec types and identifiers, leading to processing of a video-structure pointer by the mp3 decoder, and a stack-based buffer overflow.

Frequently asked questions

What is CVE-2009-4635?

FFmpeg 0.5 allows remote attackers to cause a denial of service and possibly execute arbitrary code via a crafted MOV container with improperly ordered tags that cause (1) mov.c and (2) utils.c to use inconsistent codec types and identifiers, leading to processing of a video-structure pointer by the mp3 decoder, and a stack-based buffer overflow.

How severe is CVE-2009-4635?

CVE-2009-4635 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-4635 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4635?

CVE-2009-4635 affects Ffmpeg. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4635?

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-2009-4635 published?

CVE-2009-4635 was published on 2010-02-10 and last updated on 2026-06-16.

References

• http://scarybeastsecurity.blogspot.com/2009/09/patching-ffmpeg-into-shape.html
• http://secunia.com/advisories/36805
• http://secunia.com/advisories/38643
• http://secunia.com/advisories/39482
• http://www.debian.org/security/2010/dsa-2000
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:059
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:060
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:061
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:088
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:112
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:114
• http://www.securityfocus.com/bid/36465
• http://www.ubuntu.com/usn/USN-931-1
• http://www.vupen.com/english/advisories/2010/0935
• http://www.vupen.com/english/advisories/2011/1241
• https://roundup.ffmpeg.org/roundup/ffmpeg/issue1240

Affected products (1)

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

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