🛡️ CVE-2025-61984 on Ubuntu — openssh

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.)

Distribution advisory

This page covers CVE-2025-61984 as tracked by Ubuntu, for the package openssh. The fix is available in version 1:10.2p1-2ubuntu1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Affected software

UBUNTU-CVE-2025-61984 is recorded against 2 packages.

  • openssh (fixed in 1:10.2p1-2ubuntu1)
  • openssh-ssh1

Timeline and source

Published on 6 October 2025 and last revised on 21 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
www.openwall.com (Report)
marc.info (Report)
www.openssh.com (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)

CVE-2025-61984 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-10-06
Updated 2026-08-12
Modified 2026-07-21
Fix URL N/A

Affected Packages

Software From version Fixed in
openssh — 1:10.2p1-2ubuntu1
openssh-ssh1 — —

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