CVE-2023-51767
What it is
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."
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 0.7% chance of exploitation in the next 30 days (EPSS).
- Fix
- No patch or advisory is linked yet. Look at mitigations or restrict exposure.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.7% in the next 30 days (EPSS).
- Severity: 7.0 HIGH (CVSS).
- Fix: none linked yet, which raises it.
Details
- Published
- Last modified
- Exploit probability
- 0.7% · EPSS, next 30 days
- Record status
- Modified
Affected
- Openbsd OpenSSH
- Fedoraproject Fedora 39
- Redhat Enterprise Linux 8.0
- Redhat Enterprise Linux 9.0
Attack profile CVSS 3.1 · 7.0
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2023-51767.md and follow it. Check whether this project is affected by CVE-2023-51767. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
References
- https://access.redhat.com/security/cve/CVE-2023-51767
- https://arxiv.org/abs/2309.02545
- https://bugzilla.redhat.com/show_bug.cgi?id=2255850
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
- https://github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
- https://security.netapp.com/advisory/ntap-20240125-0006/
- https://ubuntu.com/security/CVE-2023-51767
- 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