CVE-2025-61985 is classified as a low-severity vulnerability with a CVSS score of 3.6. This vulnerability allows the '\0' character in an ssh:// URI, potentially leading to code execution when a ProxyCommand is used. While the severity is low, the existence of this vulnerability could still pose risks to organizations utilizing affected versions of OpenSSH.
The risk to organizations includes the potential for unauthorized code execution if the vulnerability is exploited. Although the exploitability is low and there are currently no known public exploits, organizations should remain vigilant. The urgency for defenders is to schedule remediation as part of their regular patch management cycle.
Published on October 6, 2025, this vulnerability affects all versions of OpenSSH prior to 10.1. Given that an exploit is not confirmed, organizations should still take proactive measures to ensure their systems are updated to the latest version to mitigate any risks associated with this vulnerability.
In summary, while the immediate threat posed by CVE-2025-61985 may be low, organizations should prioritize updating their systems and remain aware of potential risks that could arise from this vulnerability.
Vulnerability Details
The official description states that ssh in OpenSSH before 10.1 allows the '\0' character in an ssh:// URI, potentially leading to code execution when a ProxyCommand is used. This vulnerability is classified under CWE-158, which pertains to improper handling of special characters.
The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N, indicating a local attack vector with high complexity and low privileges required. The impacts on confidentiality and integrity are low, while availability is not affected.
Technical Analysis
The root cause of CVE-2025-61985 lies in the improper validation of the '\0' character within ssh:// URIs. This could allow attackers to craft malicious URIs that exploit this flaw, particularly when the ProxyCommand functionality is utilized.
The attack vector is local, meaning that an attacker must have local access to the system. The attack complexity is high, requiring attackers to have a specific level of knowledge about the environment.
No user interaction is required, and the vulnerability impacts confidentiality and integrity, albeit at a low level. There is no impact on availability.
Risk & Impact Analysis
Organizations deploying vulnerable versions of OpenSSH may be at risk of unauthorized code execution via crafted ssh:// URIs. Although the exploitability is low and no public exploits currently exist, the potential for exploitation underscores the need for prompt remediation.
The blast radius for this vulnerability may be limited to systems where ProxyCommand is utilized in conjunction with ssh:// URIs, but organizations should evaluate their exposure and implement necessary updates. The CVSS score of 3.6 indicates a low urgency to address; however, organizations should not overlook this vulnerability given its potential implications.
In light of the low EPSS score of 0.0001, which places it in the 0.0097 percentile, organizations can assess this vulnerability as a lower priority but should still schedule it for remediation within their patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected by this vulnerability. Organizations using OpenSSH should ensure they upgrade to version 10.1 or later to mitigate the risks associated with CVE-2025-61985.
Mitigation & Remediation
Organizations should prioritize patching this vulnerability by upgrading to OpenSSH version 10.1 or later. If immediate patching is not feasible, it is recommended to review the usage of ProxyCommand and implement additional input validation for URIs to prevent potential exploitation.
For further guidance on securing applications, organizations can refer to the application security assessment services offered by AppSecure.
Detection Guidance
Organizations should monitor logs for any unusual ssh:// URI usage or anomalies in ProxyCommand configurations. Behavioral anomalies that deviate from established patterns could indicate potential exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2025-61985 highlights the importance of rigorous input validation in security protocols. Security teams should review their configurations and ensure that special characters are handled appropriately to prevent similar vulnerabilities in the future.
To further enhance security practices, organizations can explore resources on penetration testing methodology and vulnerability management program design to strengthen their security posture.
Additionally, staying informed about the latest trends in vulnerability exposure severity trends can help organizations anticipate potential threats and adjust their security strategies accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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