CVE-2011-3973

What it is

cavsdec.c in libavcodec in FFmpeg before 0.7.4 and 0.8.x before 0.8.3 allows remote attackers to cause a denial of service (incorrect write operation and application crash) via an invalid bitstream in a Chinese AVS video (aka CAVS) file, related to the decode_residual_block, check_for_slice, and cavs_decode_frame functions, a different vulnerability than CVE-2011-3362.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

2.5% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2011-10-02 20:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:34 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.5% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2011-10-02 20:55 UTC

Last modified

2026-06-16 23:34 UTC

Exploit probability

2.5% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Ffmpeg ≤ 0.7.3
• Ffmpeg 0.3
• Ffmpeg 0.3.1
• Ffmpeg 0.3.2
• Ffmpeg 0.3.3
• Ffmpeg 0.3.4
• Ffmpeg 0.4.0
• Ffmpeg 0.4.2

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Is it in your code?

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