Failure to Sanitize Special Element The advisory has been revoked - it doesn't affect any version of package openssh (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-OPENSSH-13426725
- published5 Feb 2026
- disclosed6 Oct 2025
Introduced: 6 Oct 2025
CVE-2025-61984 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Ubuntu.
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.)
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2025-61984
- 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
- https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984
- 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