CVE-2020-21050 json
Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c.
published 2021-09-14 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-13829
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.6%
- EPSS 1.6% chance of exploitation in 30 days, percentile 75%
- public exploits
- 0
- none known
Summary
Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c.
Patch / fix
- saitoha libsixel 1.8.3
- libsixel Debian 14, Debian 13, Debian 12 1.8.6-1
debian advisories DEBIAN-CVE-2020-21050
Exploit prediction
1.55% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/saitoha/libsixel/issues/75 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
github.com
/saitoha/libsixel/commit/7808a06b88c11dbc502318cdd51fa374f8cd47ee
patch, third-party-advisory
-
bitbucket.org
/netbsd/pkgsrc/commits/a27113e21179cbfbfae0c35f6a9edd6aa498faae
broken-link
-
github.com
/saitoha/libsixel/issues/75
exploit, issue-tracking, patch, third-party-advisory
-
cwe.mitre.org
/data/definitions/121.html
technical-description
-
github.com
/saitoha/libsixel/blob/master/ChangeLog
release-notes, third-party-advisory
-
github.com
/saitoha/libsixel/releases/tag/v1.8.5
release-notes, third-party-advisory
Sources
- CVE List CVE-2020-21050
- NVD CVE-2020-21050
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.