What’s Vulnerable › Vulnerabilities

CVE-2020-21050

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-14 · updated 2026-06-17
• Weakness: CWE-787

Description

Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c.

Affected products

• saitoha libsixel: before 1.8.3 — fixed in 1.8.3

How to fix

Upgrade to a fixed version: saitoha libsixel 1.8.3. Check the vendor advisory for mitigations.

References

• https://bitbucket.org/netbsd/pkgsrc/commits/a27113e21179cbfbfae0c35f6a9edd6aa498faae
• https://cwe.mitre.org/data/definitions/121.html
• https://github.com/saitoha/libsixel/blob/master/ChangeLog
• https://github.com/saitoha/libsixel/commit/7808a06b88c11dbc502318cdd51fa374f8cd47ee
• https://github.com/saitoha/libsixel/issues/75
• https://github.com/saitoha/libsixel/releases/tag/v1.8.5
• https://bitbucket.org/netbsd/pkgsrc/commits/a27113e21179cbfbfae0c35f6a9edd6aa498faae
• https://cwe.mitre.org/data/definitions/121.html
• https://github.com/saitoha/libsixel/blob/master/ChangeLog
• https://github.com/saitoha/libsixel/commit/7808a06b88c11dbc502318cdd51fa374f8cd47ee
• https://github.com/saitoha/libsixel/issues/75
• https://github.com/saitoha/libsixel/releases/tag/v1.8.5

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