CVE-2011-3947

CVE-2011-3947 is a medium-severity vulnerability in Ffmpeg with a CVSS 2.0 base score of 6.8. 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-119.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.8)
• EPSS exploit prediction: 4% (89th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Ffmpeg
• Published: 2012-08-20
• Last modified: 2026-06-16

Description

Buffer overflow in mjpegbdec.c in libavcodec in FFmpeg 0.7.x before 0.7.12 and 0.8.x before 0.8.11, and in Libav 0.5.x before 0.5.9, 0.6.x before 0.6.6, 0.7.x before 0.7.5, and 0.8.x before 0.8.1, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted MJPEG-B file.

Frequently asked questions

What is CVE-2011-3947?

Buffer overflow in mjpegbdec.c in libavcodec in FFmpeg 0.7.x before 0.7.12 and 0.8.x before 0.8.11, and in Libav 0.5.x before 0.5.9, 0.6.x before 0.6.6, 0.7.x before 0.7.5, and 0.8.x before 0.8.1, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted MJPEG-B file.

How severe is CVE-2011-3947?

CVE-2011-3947 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2011-3947 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-3947?

CVE-2011-3947 primarily affects Ffmpeg. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-3947?

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

When was CVE-2011-3947 published?

CVE-2011-3947 was published on 2012-08-20 and last updated on 2026-06-16.

References

• http://ffmpeg.org/
• http://git.libav.org/?p=libav.git%3Ba=commit%3Bh=b57d262412204e54a7ef8fa1b23ff4dcede622e5
• http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=b57d262412204e54a7ef8fa1b23ff4dcede622e5
• http://libav.org/
• http://secunia.com/advisories/49089
• http://www.debian.org/security/2012/dsa-2471
• http://www.ubuntu.com/usn/USN-1479-1

Affected products (33)

• cpe:2.3:a:ffmpeg:ffmpeg:0.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.7.2:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.7.6:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.7.7:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.7.8:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.7.9:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.7.11:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.8.5:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.8.6:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.8.7:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.8.8:*:*:*:*:*:*:*
• cpe:2.3:a:ffmpeg:ffmpeg:0.8.10:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.3:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.4:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.5:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.6:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.5.7:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.6:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.6.3:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.6.5:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.7:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.7.2:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.7.3:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.7.4:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.8:*:*:*:*:*:*:*
• cpe:2.3:a:libav:libav:0.8:beta2:*:*:*:*:*:*

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• CVE-2011-3937 — Critical (CVSS 10.0): The H.263 codec (libavcodec/h263dec.c) in FFmpeg 0.7.x before 0.7.12, 0.8.x before 0.8.11, and unspecified versions…
• CVE-2012-2804 — Critical (CVSS 10.0): Unspecified vulnerability in libavcodec/indeo3.c in FFmpeg before 0.11 and Libav 0.8.x before 0.8.5 has unknown impact…

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