CVE-2020-21677

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    CVE-2020-21677

    Published: 10 Aug 2021Last Modified: 9 Jul 2026

    Summary:

    Details: 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.

    References: https://github.com/saitoha/libsixel/issues/123

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 686d234ae20f97b9d816d4147ba3f4b90dbae72e
    Fixed -None

    Affected versions

    1.8.4

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2020-21677 | CVE-DB