UBUNTU-CVE-2021-21317

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    UBUNTU-CVE-2021-21317

    Published: 16 Feb 2021Last Modified: 17 Oct 2026
    Upstream:
    CVE-2021-21317

    Summary:

    Details: uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.

    References: https://ubuntu.com/security/CVE-2021-21317, https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4, https://www.npmjs.com/package/uap-core, https://www.cve.org/CVERecord?id=CVE-2021-21317

    Affected packages

    Package

    Name: uap-core

    Purl: pkg:deb/ubuntu/uap-core?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    20190213-2

    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-2021-21317 | CVE-DB