What’s Vulnerable › Vulnerabilities

CVE-2020-21548

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-17 · updated 2026-06-17
• Weakness: CWE-787

Description

Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c.

Affected products

• saitoha libsixel: 1.8.3

References

• https://github.com/saitoha/libsixel/issues/116
• https://github.com/saitoha/libsixel/issues/116

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