CVE-2023-42818

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    CVE-2023-42818

    Published: 27 Sept 2023Last Modified: 12 Aug 2026

    Summary: SSH public key login without private key challenge if mfa is enabled in jumpserver

    Details: JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/42xxx/CVE-2023-42818.json, https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv, https://nvd.nist.gov/vuln/detail/CVE-2023-42818, https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -1b157a107e15dc4eb5bca689f90a98333429c1ae

    Affected versions

    v2.27.0

    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-2023-42818 | CVE-DB