What’s Vulnerable › Vulnerabilities

CVE-2025-61984

• Severity: low (CVSS 3.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-06 · updated 2026-10-15
• Weakness: CWE-159

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.)

Affected products

• OpenSSH: before 10.1 — fixed in 10.1

How to fix

Upgrade to a fixed version: OpenSSH 10.1. Check the vendor advisory for mitigations.

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://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html
• https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984

Get alerted when CVE-2025-61984 or the next vulnerability affects your stack