CVE-2020-21688: debian debian_linux Use After Free
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2020-21688DEBIAN-CVE-2020-21688
Published 10-08-2021Last modified 04-08-2024
Vulnerability summary
CVE-2020-21688 is a high (CVSS 8.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 1.73% chance of exploitation in the next 30 days, higher than 77.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.73%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 8 · Related 5Timeline
- 10-08-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A heap-use-after-free in the av_freep function in libavutil/mem.c of FFmpeg 4.2 allows attackers to execute arbitrary code.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.73%
Chance of exploitation in the next 30 days
Percentile
77%
Versus all other CVEs
30-day change
0.00 pp
From 1.73% on 19-09-2026
19-09-202619-10-2026
EPSS score1.73%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (trac.ffmpeg.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- ffmpeg< 7:4.4-5
- debian_linuxEOL11.0
Ubuntu2 products
- ffmpeg< 7:2.8.17-0ubuntu0.1+esm2 | < 7:3.4.11-0ubuntu0.1 | < 7:4.2.7-0ubuntu0.1
- qtwebengine-opensource-srcAll versions (No fix recorded)
Ffmpeg1 product
- ffmpegEOL4.2
3 vendors · 5 products
