CVE-2021-34813

    Dashboard / Vulnerabilities / CVE-2021-34813

    CVE-2021-34813

    Published: 16 Jun 2021Last Modified: 9 Jul 2026

    Summary:

    Details: Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.

    References: https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3, https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b, https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -d856c441b69fa2d3bb081c35a077725ece3ec0e5

    Affected versions

    3.2.2
    3.2.1
    3.2.0

    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-2021-34813 | CVE-DB