CVE-2023-25136

openssh: the functions order_hostkeyalgs() and list_hostkey_types() leads to double-free vulnerability

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · February 3, 2023

Updated · May 29, 2026

Description

A flaw was found in the OpenSSH server (sshd), which introduced a double-free vulnerability during options.kex_algorithms handling. An unauthenticated attacker can trigger the double-free in the default configuration.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

CWE-401 · Missing Release of Memory after Effective Lifetime