#VU114093 Incorrect calculation in libssh - CVE-2025-5372

Vulnerability identifier: #VU114093

Vulnerability risk: Low

CVSSv4.0: 0.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/E:U/U:Clear]

CVE-ID: CVE-2025-5372

CWE-ID: CWE-682

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libssh
Universal components / Libraries / Libraries used by multiple products

Vendor: libssh

Description

The vulnerability allows a remote user to perform MitM attack.

The vulnerability exist due to incorrect calculation within the ssh_kdf() function responsible for key derivation when built with OpenSSL versions older than 3.0. A remote user can compromise the integrity of the SSH session. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libssh: All versions

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External links
https://access.redhat.com/security/cve/CVE-2025-5372
https://bugzilla.redhat.com/show_bug.cgi?id=2369388

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.