CVE-2023-25136OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling.
Updated under an hour ago ()
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 8 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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."
- CVSS
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- CWE-415
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
openbsd openssh openbsd:openssh | 9.1 | NVD |
fedoraproject fedora fedoraproject:fedora | 37; 38 | NVD |
netapp ontap_select_deploy_administration_utility netapp:ontap_select_deploy_administration_utility | all versions | NVD |
netapp a250_firmware netapp:a250_firmware | all versions | NVD |
netapp 500f_firmware netapp:500f_firmware | all versions | NVD |
netapp c250_firmware netapp:c250_firmware | all versions | NVD |
References
- https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sigpatch, vendor-advisory
- https://www.openwall.com/lists/oss-security/2023/02/02/2exploit, mailing-list, third-party-advisory
- https://bugzilla.mindrot.org/show_bug.cgi?id=3522exploit, issue-tracking, third-party-advisory
- https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946patch, third-party-advisory
- https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/exploit, third-party-advisory
- https://news.ycombinator.com/item?id=34711565issue-tracking, third-party-advisory
- http://www.openwall.com/lists/oss-security/2023/02/13/1mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2023/02/22/1mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2023/02/22/2mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2023/02/23/3mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2023/03/06/1mailing-list, third-party-advisory
- http://www.openwall.com/lists/oss-security/2023/03/09/2mailing-list, third-party-advisory
- https://security.netapp.com/advisory/ntap-20230309-0003/third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/vendor-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/vendor-advisory
- https://security.gentoo.org/glsa/202307-01vendor-advisory, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.