CVE-2021-22876

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    CVE-2021-22876

    Published: 1 Apr 2021Last Modified: 8 Jul 2026

    Summary:

    Details: curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

    References: https://lists.debian.org/debian-lts-announce/2021/05/msg00019.html, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5BMIOKLBQJSFCHEDN2G2C2SH274BP/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVWPVGLFISU5BJC2BXBRYSDXTXE2YGC/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUIOYX2KUU6FIUZVB5WWZ6JHSSYSQWJ/, https://security.gentoo.org/glsa/202105-36, https://security.netapp.com/advisory/ntap-20210521-0007/, https://www.oracle.com//security-alerts/cpujul2021.html, https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf, https://curl.se/docs/CVE-2021-22876.html, https://hackerone.com/reports/1101882

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 8d2c24265d6d8ed74e3d2dc646cb1c3d20f290f3
    Fixed -None

    Affected versions

    curl-7_75_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-2021-22876 | CVE-DB