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Medium severity6.5NVD Advisory· Published Aug 10, 2021· Updated Apr 24, 2026

CVE-2020-21677

CVE-2020-21677

Description

A heap-based buffer overflow in the sixel_encoder_output_without_macro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (DOS) via converting a crafted PNG file into Sixel format.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Saitoha/Libsixel2 versions
    cpe:2.3:a:saitoha:libsixel:1.8.4:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:saitoha:libsixel:1.8.4:*:*:*:*:*:*:*
    • (no CPE)range: =1.8.4

Patches

Vulnerability mechanics

References

1

News mentions

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