CVE-2020-21688: Use After Free
First published: Tue Aug 10 2021(Updated: )
A heap-use-after-free in the av_freep function in libavutil/mem.c of FFmpeg 4.2 allows attackers to execute arbitrary code.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FFmpeg FFmpeg | =4.2 | |
| Debian Debian Linux | =11.0 | |
| debian/ffmpeg | 7:4.3.7-0+deb11u1 7:4.3.8-0+deb11u1 7:5.1.6-0+deb12u1 7:7.0.2-3 7:7.1-3 |
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Reference Links
- https://trac.ffmpeg.org/ticket/8186
- https://www.debian.org/security/2021/dsa-4998
- https://launchpad.net/bugs/cve/CVE-2020-21688
- http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=22c3cd176079dd104ec7610ead697235b04396f1
- http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=f7c9b1ed56b98eede5756d6865a10305982b4570
- http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=f1a77222da98dbe4b8eeda54d68deefe6adcd299
- https://security-tracker.debian.org/tracker/CVE-2020-21688
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-21688
- https://nvd.nist.gov/vuln/detail/CVE-2020-21688
- https://ubuntu.com/security/CVE-2020-21688
Frequently Asked Questions
What is CVE-2020-21688?
CVE-2020-21688 is a heap-use-after-free vulnerability in the av_freep function of FFmpeg 4.2.
How does CVE-2020-21688 work?
CVE-2020-21688 works by allowing attackers to execute arbitrary code through a heap-use-after-free vulnerability in FFmpeg.
What software is affected by CVE-2020-21688?
FFmpeg versions 4.2.7-0ubuntu0.1, 2.8.17-0ubuntu0.1+, 3.4.11-0ubuntu0.1, 4.4, and various Debian versions are affected by CVE-2020-21688.
How can I fix CVE-2020-21688?
To fix CVE-2020-21688, update FFmpeg to version 4.2.7-0ubuntu0.1 or apply the appropriate patches from the vendor.
Where can I find more information about CVE-2020-21688?
You can find more information about CVE-2020-21688 on the CVE Mitre website, the FFmpeg ticket #8186, and the Ubuntu Security Notices page USN-5472-1.
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