CVE-2025-5987 Information

Description

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior including compromised data confidentiality and integrity or crashes.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

Reference

https://access.redhat.com/security/cve/CVE-2025-5987 https://bugzilla.redhat.com/show_bug.cgi?id=2376219

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

LOW

Base Severity

5.0

Related CNNVD

CNNVD-202507-688 (Published: 2025-07-07)