CVE-2021-31875

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    CVE-2021-31875

    Published: 29 Apr 2021Last Modified: 8 Jul 2026

    Summary:

    Details: In mjs_json.c in Cesanta MongooseOS mJS 1.26, a maliciously formed JSON string can trigger an off-by-one heap-based buffer overflow in mjs_json_parse, which can potentially lead to redirection of control flow. NOTE: the original reporter disputes the significance of this finding because "there isn’t very much of an opportunity to exploit this reliably for an information leak, so there isn’t any real security impact."

    References: https://github.com/cesanta/mjs/releases/tag/1.26, https://github.com/418sec/mjs/pull/2, https://huntr.dev/bounties/1-other-mjs/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 30aa0f84dbb274afdd95006ed18431e131654cac
    Fixed -None

    Affected versions

    1.26

    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-2021-31875 | CVE-DB