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    CVE-2021-34813

    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.

    Published:Jun 16, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 16, 2021
    EPSS Score:0.04458
    CVSS Score:9.8

    Affected Products

    Vendor
    Matrix
    Product
    Olm

    Exploits

    https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolmhttps://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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