UBUNTU-CVE-2020-21677

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    UBUNTU-CVE-2020-21677

    Published: 10 Aug 2021Last Modified: 20 May 2026
    Upstream:
    CVE-2020-21677

    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://ubuntu.com/security/CVE-2020-21677, https://github.com/saitoha/libsixel/issues/123, https://www.cve.org/CVERecord?id=CVE-2020-21677

    Affected packages

    Package

    Name: libsixel

    Purl: pkg:deb/ubuntu/libsixel?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.4.2-1

    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
    UBUNTU-CVE-2020-21677 | CVE-DB