CVE-2025-8277

LOW EPSS 29.3%

Published Sep 9, 20259mo ago · Modified Jun 17, 20261w ago

3.1 CVSS 3.1

Low

Published Sep 9, 2025 9mo ago

Last Modified Jun 17, 2026 1w ago

Description

A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.

CVSS Details

Base Score

3.1

Exploitability

1.6

Impact

1.4

Vector string

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

Attack Vector Network

Attack Complexity High

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability Low

Threat Intelligence

EPSS Exploit Probability

29.3% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-401

References 4

access.redhat.com https://access.redhat.com/errata/RHSA-2026:18683
access.redhat.com https://access.redhat.com/security/cve/CVE-2025-8277
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2383888
libssh.org https://www.libssh.org/security/advisories/CVE-2025-8277.txt

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.