Failure to Sanitize Special Element Affecting openssh package, versions <1:8.2p1-4ubuntu0.13+esm1


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.28% (20th percentile)

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  • Snyk IDSNYK-UBUNTU2004-OPENSSH-13426723
  • published5 Feb 2026
  • disclosed6 Oct 2025

Introduced: 6 Oct 2025

CVE-2025-61984  (opens in a new tab)
CWE-159  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 openssh to version 1:8.2p1-4ubuntu0.13+esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

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 Base Scores

version 3.1