The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4057 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4057-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Colin Watson     February 18, 2025                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : openssh     Version        : 1:8.4p1-5+deb11u4     CVE ID         : CVE-2025-26465

    The Qualys Threat Research Unit (TRU) discovered that the OpenSSH client     is vulnerable to a machine-in-the-middle attack if the VerifyHostKeyDNS     option is enabled (disabled by default).

    Details can be found in the Qualys advisory at     https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt

    For Debian 11 bullseye, this problem has been fixed in version     1:8.4p1-5+deb11u4.

    We recommend that you upgrade your openssh packages.

    For the detailed security status of openssh please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/openssh

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

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Debian dla-4057 : openssh-client - security update

medium Nessus Plugin ID 216406

Version 1.3

Version 1.1

Version 1.3 Feb 21, 2025, 4:57 PM Plugin metadata (Added IAVM info) Plugin Feed: 202502211657
Version 1.1 Feb 18, 2025, 4:30 PM New Plugin Feed: 202502181630