CVE-2023-25136

FAUCET Score

CVE-2023-25136 is a double-free vulnerability in OpenSSH server (sshd) 9.1, affecting products like Fedora, NetApp, and OpenBSD. An unauthenticated remote attacker can exploit this in the default configuration to jump to arbitrary memory locations, with theoretical remote code execution possibilities. The vulnerability has a CVSS score of 6.5 (Medium) due to its network attack vector and high impact on availability, though exploitation complexity is also high. Its EPSS score of 0.904830000 indicates a high likelihood of exploitation. Currently, there is no evidence of active exploitation, and no public exploit code (Metasploit, Nuclei, ExploitDB) or KEV entry exists. Community discussion and media coverage are minimal, which is typical for most CVEs.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		9.1CPE matchmatch criteria	cpe:2.3:a:openbsd:openssh:9.1:::::::*
		37CPE matchmatch criteria	cpe:2.3:o:fedoraproject:fedora:37:::::::*
		38CPE matchmatch criteria	cpe:2.3:o:fedoraproject:fedora:38:::::::*
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:::::::*
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:o:netapp:a250_firmware:-:::::::*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

HIGH

Exploitability Score

2.2

Impact Score

4.2

CvssVersion

3.1

Exploit Intelligence

EPSS Score

89.95%

Probability of exploitation in next 30 days

EPSS Percentile

99.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-25

Model: v2026.06.15

This CVE's current EPSS score of 0.8995 is in the 100th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference

View patch

microsoftpatch availablevia msrc

Product: cm1 openssh 8.9p1-3 on CBL Mariner 1.0Fixed in: 8.9p1-3

microsoftpatch availablevia msrc

Product: cbl2 openssh 8.9p1-8 on CBL Mariner 2.0Fixed in: 8.9p1-8

microsoftpatch availablevia msrc

Product: 17825-16820Fixed in: 8.9p1-3

microsoftpatch availablevia msrc

Product: 17996-16823Fixed in: 8.9p1-8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: openssh-0:8.7p1-29.el9_2

View patch

Vendor Advisories (2)

microsoft2023-Feb/CVE-2023-25136Moderate

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."

Feb 14, 2023

redhatCVE-2023-25136Moderate

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

Feb 3, 2023