CVE-2021-22897

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    CVE-2021-22897

    Published: 11 Jun 2021Last Modified: 9 Jul 2026

    Summary:

    Details: curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single "static" variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly.

    References: https://security.netapp.com/advisory/ntap-20210727-0007/, https://hackerone.com/reports/1172857, https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf, https://curl.se/docs/CVE-2021-22897.html, https://github.com/curl/curl/commit/bbb71507b7bab52002f9b1e0880bed6a32834511, https://www.oracle.com//security-alerts/cpujul2021.html, https://www.oracle.com/security-alerts/cpuapr2022.html, https://www.oracle.com/security-alerts/cpujan2022.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- eb8138405a3f747f2c236464932f72e918946f68
    Fixed -None

    Affected versions

    curl-7_76_1

    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-2021-22897 | CVE-DB