CVE-2023-25136

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

89.69% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.8% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2023-02-03 00:00Z3 YR AGO

Last updated

2026-05-28 17:43Z3 MO AGO

Reserved

2023-02-03

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-415Double FreeVariant
• CWE-401Missing Release of Memory after Effective LifetimeVariant

Data version

5.2

Document digest

e3ca6510874b6b55e023fed087d0d74d1138d2799aa8cceb59292c6430586a9d

• ftp.openbsd.orghttps://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2023/02/02/2
• bugzilla.mindrot.orghttps://bugzilla.mindrot.org/show_bug.cgi?id=3522
• github.comhttps://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946
• jfrog.comhttps://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/
• news.ycombinator.comhttps://news.ycombinator.com/item?id=34711565
• www.openwall.com[oss-security] 20230213 Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)http://www.openwall.com/lists/oss-security/2023/02/13/1mailing-list
• www.openwall.com[oss-security] 20230222 Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)http://www.openwall.com/lists/oss-security/2023/02/22/1mailing-list
• www.openwall.com[oss-security] 20230222 Re: Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)http://www.openwall.com/lists/oss-security/2023/02/22/2mailing-list
• www.openwall.com[oss-security] 20230223 Re: Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)http://www.openwall.com/lists/oss-security/2023/02/23/3mailing-list
• www.openwall.com[oss-security] 20230306 Re: Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)http://www.openwall.com/lists/oss-security/2023/03/06/1mailing-list
• www.openwall.com[oss-security] 20230309 Re: Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)http://www.openwall.com/lists/oss-security/2023/03/09/2mailing-list
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20230309-0003/
• lists.fedoraproject.orgFEDORA-2023-1176c8b10chttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/vendor-advisory
• lists.fedoraproject.orgFEDORA-2023-123647648ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/vendor-advisory
• security.gentoo.orgGLSA-202307-01https://security.gentoo.org/glsa/202307-01vendor-advisory