#VU115171 Double free in libssh - CVE-2025-5351

Vulnerability identifier: #VU115171

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:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-5351

CWE-ID: CWE-415

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 a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the internal function responsible for converting cryptographic keys into serialized formats. A remote user can trigger a double free error and perform a denial of service attack in low-memory scenarios.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libssh: 0.3.0 - 0.10.0

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2369367

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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.