PT-2021-6540 · FFmpeg+5 · Ffmpeg+5

Published 2019-09-11 · Updated 2025-07-11 · CVE-2020-21697

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions FFmpeg version 4.2

Description The issue is related to a heap-use-after-free in the mpeg mux write packet function in libavformat/mpegenc.c of FFmpeg. This allows a remote attacker to cause a denial of service (DOS) via a crafted avi file.

Recommendations For FFmpeg version 4.2, consider updating to a newer version to mitigate the risk. As a temporary workaround, avoid using the mpeg mux write packet function in libavformat/mpegenc.c until a patch is available. Restrict access to crafted avi files to minimize the risk of exploitation.

Exploit

Fix

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2019-2678

BDU:2022-01801

CVE-2020-21697

DSA-4998-1

DSA-5126-1

OESA-2025-1771

OESA-2025-1772

OESA-2025-1773

OPENSUSE-SU-2021:2919-1

OPENSUSE-SU-2021_2919-1

SUSE-SU-2021:2919-1

SUSE-SU-2021:2929-1

USN-5167-1

USN-5472-1

Affected Products

Alt Linux

Astra Linux

Ffmpeg

Linuxmint

Suse

Ubuntu

References · 152

• 🔥 https://trac.ffmpeg.org/ticket/8188 · Exploit
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2023-0426SE17 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-22022 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2025-1772 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-22026 · Security Note
• https://ubuntu.com/security/CVE-2020-22036 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-22051 · Security Note
• https://ubuntu.com/security/CVE-2020-22017 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:2919-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-22039 · Security Note
• https://ubuntu.com/security/CVE-2020-20450 · Vendor Advisory
• https://osv.dev/vulnerability/USN-5472-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:2929-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-22921 · Security Note
• https://ubuntu.com/security/CVE-2020-22044 · Vendor Advisory