CVE-2025-61984: OpenBSD OpenSSH

Low severity, CVSS 3.6. EPSS: 0.4% chance of exploitation in the next 30 days.

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

• OpenBSD OpenSSH: before 10.1 (fixed in 10.1)
• Siemens SIMATIC s7-1500 CPU 1518-4 Pn/dp Mfp: from V3.1.6
• Siemens SIMATIC s7-1500 CPU 1518f-4 Pn/dp Mfp: from V3.1.6
• Siemens Siplus s7-1500 CPU 1518-4 Pn/dp Mfp: from V3.1.6

Published 2025-10-06. Last modified 2026-10-09.