CVE-2023-51767

OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer value of authenticated in mm_answer_authpassword does not resist flips of a single bit. NOTE: this is applicable to a certain threat model of attacker-victim co-location in which the attacker has user privileges. NOTE: this is disputed by the Supplier, who states "we do not consider it to be the application's responsibility to defend against platform architectural weaknesses."

• https://access.redhat.com/security/cve/CVE-2023-51767Third Party Advisory
• https://arxiv.org/abs/2309.02545Technical Description
• https://bugzilla.redhat.com/show_bug.cgi?id=2255850Issue Tracking, Third Party Advisory
• https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77Product
• https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878Product
• https://security.netapp.com/advisory/ntap-20240125-0006/Third Party Advisory
• https://ubuntu.com/security/CVE-2023-51767Third Party Advisory
• https://www.openwall.com/lists/oss-security/2025/09/22/1
• http://www.openwall.com/lists/oss-security/2025/09/22/1
• http://www.openwall.com/lists/oss-security/2025/09/22/2
• http://www.openwall.com/lists/oss-security/2025/09/23/1
• http://www.openwall.com/lists/oss-security/2025/09/23/3
• http://www.openwall.com/lists/oss-security/2025/09/23/4
• http://www.openwall.com/lists/oss-security/2025/09/23/5
• http://www.openwall.com/lists/oss-security/2025/09/24/4
• http://www.openwall.com/lists/oss-security/2025/09/24/7
• http://www.openwall.com/lists/oss-security/2025/09/25/2
• http://www.openwall.com/lists/oss-security/2025/09/25/6
• http://www.openwall.com/lists/oss-security/2025/09/26/2
• http://www.openwall.com/lists/oss-security/2025/09/26/4
• http://www.openwall.com/lists/oss-security/2025/09/27/1
• http://www.openwall.com/lists/oss-security/2025/09/27/2
• http://www.openwall.com/lists/oss-security/2025/09/27/3
• http://www.openwall.com/lists/oss-security/2025/09/27/4
• http://www.openwall.com/lists/oss-security/2025/09/27/5
• http://www.openwall.com/lists/oss-security/2025/09/27/6
• http://www.openwall.com/lists/oss-security/2025/09/27/7
• http://www.openwall.com/lists/oss-security/2025/09/28/7
• http://www.openwall.com/lists/oss-security/2025/09/29/1
• http://www.openwall.com/lists/oss-security/2025/09/29/4
• http://www.openwall.com/lists/oss-security/2025/09/29/5
• http://www.openwall.com/lists/oss-security/2025/09/29/6
• http://www.openwall.com/lists/oss-security/2025/10/01/1
• http://www.openwall.com/lists/oss-security/2025/10/01/2
• https://access.redhat.com/security/cve/CVE-2023-51767Third Party Advisory
• https://arxiv.org/abs/2309.02545Technical Description
• https://bugzilla.redhat.com/show_bug.cgi?id=2255850Issue Tracking, Third Party Advisory
• https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77Product
• https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878Product
• https://security.netapp.com/advisory/ntap-20240125-0006/Third Party Advisory
• https://ubuntu.com/security/CVE-2023-51767Third Party Advisory

Published

Dec 24, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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