GO-2021-0356

    Dashboard / Vulnerabilities / GO-2021-0356

    GO-2021-0356

    Published: 25 Apr 2022Last Modified: 4 Feb 2026

    Summary: Denial of service via crafted Signer in golang.org/x/crypto/ssh

    Details: Attackers can cause a crash in SSH servers when the server has been configured by passing a Signer to ServerConfig.AddHostKey such that 1) the Signer passed to AddHostKey does not implement AlgorithmSigner, and 2) the Signer passed to AddHostKey returns a key of type “ssh-rsa” from its PublicKey method. Servers that only use Signer implementations provided by the ssh package are unaffected.

    References: https://go.dev/cl/392355, https://go.googlesource.com/crypto/+/1baeb1ce4c0b006eff0f294c47cb7617598dfb3d, https://groups.google.com/g/golang-announce, https://groups.google.com/g/golang-announce/c/-cp44ypCT5s

    Affected packages

    Package

    Name: golang.org/x/crypto

    Purl: pkg:golang/golang.org/x/crypto

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -0.0.0-20220314234659-1baeb1ce4c0b

    Affected versions

    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
    GO-2021-0356 | CVE-DB