CVE-2023-25136

Openssh vulnerability

CVSS

6.5

EPSS

90.0%

EPSS pct

100th

Exploited

No known

OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."

Affected vendor

Openbsd

Affected product

Openssh

CVSS vector

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

Weakness type (CWE)

CWE-415 — Double Free

Published

2023-02-03

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to integrity, high impact to availability.

Its EPSS score of 90.0% reflects a high probability of exploitation activity in the wild over the next 30 days, placing it among the most exploited CVEs currently tracked.

Check your external exposure to CVE-2023-25136

Confirm whether Openbsd Openssh is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2023-25136.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2023-25136

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