Improper Neutralization of Null Byte or NUL Character in OpenSSH - CVE-2025-61985

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Main Vulnerability Database Vulnerabilities #VU116883

Improper Neutralization of Null Byte or NUL Character in OpenSSH - CVE-2025-61985

Published: October 10, 2025


Vulnerability identifier: #VU116883
CSH Severity: Low
CVSS v4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-61985
CWE-ID: CWE-158
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary OS commands on the system.

The vulnerability exists due to incorrect handling of the nullbyte character in an ssh:// URI if a ProxyCommand that uses the %r expansion was configured. A remote attacker can trick the victim into using a specially crafted ssh command to connect to a remote server and execute arbitrary OS commands on the system.

This vulnerability affects ssh client command and does not affect the sshd daemon. 


Affected software

OpenSSH
SUSE Manager Server 4.3
SUSE Manager Retail Branch Server 4.3
SUSE Linux Enterprise Server 15 SP3
SUSE Manager Proxy 4.3
Debian Linux
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Enterprise Storage
IBM i
Red Hat Enterprise Linux for x86_64
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Basesystem Module
Desktop Applications Module
openSUSE Leap
openEuler
Ubuntu
Oracle Solaris
IBM Cloud Pak System
LANTIME Operating System Firmware (LTOS)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
pam_ssh_agent_auth
openssh-cavs
openssh-clients
openssh-askpass
openssh
openssh-keycat
openssh-server
openssh-ldap
openssh (Red Hat package)
openssh (Ubuntu package)
openssh-help
openssh-debugsource
openssh-debuginfo
openssh8.4-clients
openssh8.4-common-debuginfo
openssh8.4-clients-debuginfo
openssh8.4
openssh8.4-server
openssh8.4-helpers
openssh8.4-server-debuginfo
openssh8.4-debugsource
openssh8.4-helpers-debuginfo
openssh8.4-fips
openssh8.4-common
openssh-cavs-debuginfo
openssh-common-debuginfo
openssh-helpers-debuginfo
openssh-server-debuginfo
openssh-askpass-gnome-debuginfo
openssh-askpass-gnome-debugsource
openssh-clients-debuginfo
openssh-fips
openssh-askpass-gnome
openssh-common
openssh-helpers
openssh (Debian package)
openssh-doc
openssh-sk-dummy
openssh-server-config-disallow-rootlogin
OpenShift Virtualization
Red Hat Update Infrastructure (RHUI)
IBM Power Hardware Management Console (HMC)

How to mitigate CVE-2025-61985

Install updates from vendor's website.

OpenSSH - update to 10.1p1
IBM Cloud Pak System - update to 2.3.5.1
LANTIME Operating System Firmware (LTOS) - update to 7.10.005
pam_ssh_agent_auth - update to 0.10.3-7.27.0.1
pam_ssh_agent_auth - addressed in versions 0.10.3-9.33, 0.10.4-4.9, 0.10.4-4.37, 0.10.4-5.9
OpenShift Virtualization - update to 4.19.17
Red Hat Update Infrastructure (RHUI) - update to 5.0.0
openssh-cavs - update to 8.0p1-27.0.1
openssh-clients - addressed in versions 8.0p1-27.0.1, 9.6p1-4
openssh-askpass - addressed in versions 8.0p1-27.0.1, 9.6p1-4
openssh - addressed in versions 8.0p1-27.0.1, 9.6p1-4
openssh-keycat - addressed in versions 8.0p1-27.0.1, 9.6p1-4
openssh-server - addressed in versions 8.0p1-27.0.1, 9.6p1-4
openssh-ldap - update to 8.0p1-27.0.1
openssh (Red Hat package) - addressed in versions 8.0p1-27.el8_10, 8.7p1-13.el9_0.1, 8.7p1-30.el9_2.9, 8.7p1-38.el9_4.6, 8.7p1-45.el9_6.1, 9.9p1-7.el10_0.1
openssh (Ubuntu package) - addressed in versions 1:8.2p1-4ubuntu0.13+esm1, 1:8.9p1-3ubuntu0.14, 1:9.6p1-3ubuntu13.15, 1:10.0p1-5ubuntu5.1
openssh-askpass - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-help - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-server - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-ldap - update to 8.2p1-33
openssh-keycat - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-debugsource - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-debuginfo - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-clients - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh-cavs - update to 8.2p1-33
openssh - addressed in versions 8.2p1-33, 8.8p1-37, 9.3p2-9, 9.6p1-9
openssh8.4-clients - update to 8.4p1-8.19.1
openssh8.4-common-debuginfo - update to 8.4p1-8.19.1
openssh8.4-clients-debuginfo - update to 8.4p1-8.19.1
openssh8.4 - update to 8.4p1-8.19.1
openssh8.4-server - update to 8.4p1-8.19.1
openssh8.4-helpers - update to 8.4p1-8.19.1
openssh8.4-server-debuginfo - update to 8.4p1-8.19.1
openssh8.4-debugsource - update to 8.4p1-8.19.1
openssh8.4-helpers-debuginfo - update to 8.4p1-8.19.1
openssh8.4-fips - update to 8.4p1-8.19.1
openssh8.4-common - update to 8.4p1-8.19.1
openssh-cavs-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-common-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-cavs - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-debugsource - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-helpers-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-server-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-clients - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-askpass-gnome-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-askpass-gnome-debugsource - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-clients-debuginfo - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-fips - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-server - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-askpass-gnome - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-common - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh-helpers - addressed in versions 8.4p1-150300.3.57.1, 9.6p1-150600.6.34.1
openssh (Debian package) - addressed in versions 1:9.2p1-2+deb12u9, 1:10.0p1-7+deb13u2
openssh-doc - update to 9.6p1-4
openssh-sk-dummy - update to 9.6p1-4
openssh-server-config-disallow-rootlogin - update to 9.6p1-150600.6.34.1
IBM Power Hardware Management Console (HMC) - addressed in versions 10.3.1063.2, 11.1.1111.5
Oracle Solaris - addressed in versions 11.3 ESU 36.35, 11.4 SRU 89

External References

Related Security Bulletins