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CVE-2025-26465 — MitM attack allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it | Kitploit
Tools/GitHubGitHub/rxerium/cve-2025-26465
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GitHubrxerium/cve-2025-26465

CVE-2025-26465

MitM attack allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it

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9111 months agoNot yet reviewed

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CVE-2025-26465

The OpenSSH client contains a logic error between versions 6.8p1 to 9.9p1 (inclusive) that makes it vulnerable to an active MitM attack if the VerifyHostKeyDNS option is enabled, allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it

How does this detection method work?

This template matches on the following vulnerable versions:

root@kitploit:~
          - "SSH-2.0-OpenSSH_6.8p1"
          - "SSH-2.0-OpenSSH_6.9p1"
          - "SSH-2.0-OpenSSH_7.0p1"
          - "SSH-2.0-OpenSSH_7.1p1"
          - "SSH-2.0-OpenSSH_7.2p1"
          - "SSH-2.0-OpenSSH_7.3p1"
          - "SSH-2.0-OpenSSH_7.4p1"
          - "SSH-2.0-OpenSSH_7.5p1"
          - "SSH-2.0-OpenSSH_7.6p1"
          - "SSH-2.0-OpenSSH_7.7p1"
          - "SSH-2.0-OpenSSH_7.8p1"
          - "SSH-2.0-OpenSSH_7.9p1"
          - "SSH-2.0-OpenSSH_8.0p1"
          - "SSH-2.0-OpenSSH_8.1p1"
          - "SSH-2.0-OpenSSH_8.2p1"
          - "SSH-2.0-OpenSSH_8.3p1"
          - "SSH-2.0-OpenSSH_8.4p1"
          - "SSH-2.0-OpenSSH_8.5p1"
          - "SSH-2.0-OpenSSH_8.6p1"
          - "SSH-2.0-OpenSSH_8.7p1"
          - "SSH-2.0-OpenSSH_8.8p1"
          - "SSH-2.0-OpenSSH_8.9p1"
          - "SSH-2.0-OpenSSH_9.0p1"
          - "SSH-2.0-OpenSSH_9.1p1"
          - "SSH-2.0-OpenSSH_9.2p1"
          - "SSH-2.0-OpenSSH_9.3p1"
          - "SSH-2.0-OpenSSH_9.4p1"
          - "SSH-2.0-OpenSSH_9.5p1"
          - "SSH-2.0-OpenSSH_9.6p1"
          - "SSH-2.0-OpenSSH_9.7p1"
          - "SSH-2.0-OpenSSH_9.8p1"
          - "SSH-2.0-OpenSSH_9.9p1"

If there is a match, the host is considered to be vulnerable to CVE-2025-26465.

How do I run this script?

  1. Download Nuclei from here
  2. Copy the template to your local system
  3. Run the following command: nuclei -u https://yourHost.com -t template.yaml

References

  • https://thehackernews.com/2025/02/new-openssh-flaws-enable-man-in-middle.html

Disclaimer

Use at your own risk, I will not be responsible for illegal activities you conduct on infrastructure you do not own or have permission to scan.

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