wolfSSL wolfSSH up to 1.4.21 information disclosure

Summaryinfo

A vulnerability described as problematic has been identified in wolfSSL wolfSSH up to 1.4.21. The impacted element is an unknown function. Such manipulation leads to information disclosure. This vulnerability is traded as CVE-2025-14942. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in wolfSSL wolfSSH up to 1.4.21 and classified as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

wolfSSH’s key exchange state machine can be manipulated to leak the client’s password in the clear, trick the client to send a bogus signature, or trick the client into skipping user authentication. This affects client applications with wolfSSH version 1.4.21 and earlier. Users of wolfSSH must update or apply the fix patch and it’s recommended to update credentials used. This fix is also recommended for wolfSSH server applications. While there aren’t any specific attacks on server applications, the same defect is present. Thanks to Aina Toky Rasoamanana of Valeo and Olivier Levillain of Telecom SudParis for the report.

The weakness was shared by Aina Toky Rasoamanana and Olivier Levillain. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-14942 since 12/18/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 1.4.22 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-0990). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• wolfSSL

Name

• wolfSSH

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6
• 1.4.7
• 1.4.8
• 1.4.9
• 1.4.10
• 1.4.11
• 1.4.12
• 1.4.13
• 1.4.14
• 1.4.15
• 1.4.16
• 1.4.17
• 1.4.18
• 1.4.19
• 1.4.20
• 1.4.21

License

• open-source

Website

• Product: https://github.com/wolfSSL/wolfssh/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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