CVE-2023-25136

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 3.1

6.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

EPSS

90% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-25)

CWE

CWE-415

Published

2023-02-03

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• fedoraproject:fedora
• netapp:500f_firmware
• netapp:a250_firmware
• netapp:c250_firmware
• netapp:ontap_select_deploy_administration_utility
• openbsd:openssh

References

• http://www.openwall.com/lists/oss-security/2023/02/13/1
• http://www.openwall.com/lists/oss-security/2023/02/22/1
• http://www.openwall.com/lists/oss-security/2023/02/22/2
• http://www.openwall.com/lists/oss-security/2023/02/23/3
• http://www.openwall.com/lists/oss-security/2023/03/06/1

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