CVE-2025-61984

Description

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.)

CVSS v3.1 Score

3.6

LOW

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-159 CWE-159

References

Other References

https://marc.info/?l=openssh-unix-dev&m=175974522032149&w=2 https://www.openssh.com/releasenotes.html#10.1p1 https://www.openwall.com/lists/oss-security/2025/10/06/1 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 https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984

Frequently Asked Questions

What is CVE-2025-61984? +

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.) It has a CVSS v3.1 base score of 3.6 (LOW).

How severe is CVE-2025-61984? +

CVE-2025-61984 has a CVSS v3.1 score of 3.6 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

How do I check if I'm vulnerable to CVE-2025-61984? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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