CVE-2025-61984

Summary

ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)

Affected Software

Weaknesses

• CWE-159: CWE-159 Improper Handling of Invalid Use of Special Elements

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2025/10/07/1
• http://www.openwall.com/lists/oss-security/2025/10/12/1
• https://www.vicarius.io/vsociety/posts/cve-2025-61984-detection-script-remote-code-execution-vulnerability-affecting-openssh
• https://www.vicarius.io/vsociety/posts/cve-2025-61984-mitigation-script-remote-code-execution-vulnerability-affecting-openssh

References

• https://www.openwall.com/lists/oss-security/2025/10/06/1
• https://marc.info/?l=openssh-unix-dev&m=175974522032149&w=2
• https://www.openssh.com/releasenotes.html#10.1p1

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