CVE-2023-25136
MEDIUMEPSS 100th pctlDescription
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."
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 100% of all known CVEs.
References
Related Vulnerabilities
Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2018-0101 | Critical | 10.0 | 87% | - | Fix |
| CVE-2003-0545 | Critical | 9.8 | 85% | - | Fix |
| CVE-2019-3829 | Medium | 5.3 | 59% | - | Fix |
| CVE-2026-33824 | Critical | 9.8 | 56% | - | Fix |
| CVE-2021-3407 | Medium | 5.5 | 50% | - | Fix |
| CVE-2026-23918 | High | 8.8 | 50% | - | Fix |
Common questions
How do I fix CVE-2023-25136?
Published advisories record a fix for 29 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2023-25136 being actively exploited?
Not that we know of. CVE-2023-25136 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 89.7% is the estimated probability that it will be exploited in the next 30 days. That is higher than 100% of all scored CVEs.
How severe is CVE-2023-25136?
CVE-2023-25136 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2023-25136 affect?
Published advisories record a fix for openssh (Debian), openssh (Rocky), openssh (Red Hat / RHEL), openssh-askpass (Red Hat / RHEL), and 25 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-28.