Home/CVE/ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources
CVE

CVE-2025-61984

ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources

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.)

LOW · CVSS 3.6 EPSS 0.00012
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-159Improper Handling of Invalid Use of Special Elements
▣

Scoring & Timeline

3.6
LOW · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Oct 2025 · 07:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

26
usnUSN-8090-2
usnUSN-8090-1
rhsaRHSA-2026:5475Important
suse-csafSUSE-SU-2026:20662-1
rhsaRHSA-2026:1652Important
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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