CVE-2023-51767 json
OpenSSH through 10.0, when common types of DRAM are used, might allow row hammer attacks (for authentication bypass) because the integer va…
published 2023-12-24 2 y ago modified 2026-10-15 25 d ago also EUVD-2023-56456
- cvss
- 7.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
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."
Patch / fix
- Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1
- openssh Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 9.7_p1-r0
alpine advisories ALPINE-CVE-2023-51767
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2023-51767 updated cvss 7.0
openssh: authentication bypass via row hammer attack
-
Red Hat Enterprise Linux 6 openssh, openssh-ldap, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_auth Red Hat Enterprise Linux 7 openssh, openssh-cavs, openssh-ldap, openssh-keycat, openssh-server, openssh-askpass, +3 moreaffected: workaround, no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 8 openssh, openssh-cavs, openssh-ldap, openssh-keycat, openssh-server, openssh-askpass, +2 more Red Hat Enterprise Linux 9 openssh, openssh-keycat, openssh-server, openssh-askpass, openssh-clients, pam_ssh_agent_authaffected: workaround, no fix planned “Will not fix”
-
Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9under investigation
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
cisa ICSA-23-166-11 updated cvss 7.0
Siemens SIMATIC S7-1500 TM MFP Linux Kernel
-
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem <V1.1affected: fixed in V1.1, workaround support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
References
-
arxiv.org
/abs/2309.02545
technical-description
-
github.com
/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c#L878
product
-
github.com
/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c#L77
product
-
bugzilla.redhat.com
/show_bug.cgi?id=2255850
issue-tracking, third-party-advisory
-
access.redhat.com
/security/cve/CVE-2023-51767
third-party-advisory
-
ubuntu.com
/security/CVE-2023-51767
third-party-advisory
-
security.netapp.com
/advisory/ntap-20240125-0006/
third-party-advisory
- openwall.com /lists/oss-security/2025/09/22/1
- openwall.com /lists/oss-security/2025/10/01/1
- openwall.com /lists/oss-security/2025/09/22/1
- openwall.com /lists/oss-security/2025/09/24/4
- openwall.com /lists/oss-security/2025/09/22/2
- openwall.com /lists/oss-security/2025/09/23/4
- openwall.com /lists/oss-security/2025/10/01/2
- openwall.com /lists/oss-security/2025/09/26/2
- openwall.com /lists/oss-security/2025/09/26/4
- openwall.com /lists/oss-security/2025/09/27/1
- openwall.com /lists/oss-security/2025/09/27/2
- openwall.com /lists/oss-security/2025/09/27/3
- openwall.com /lists/oss-security/2025/09/27/5
- openwall.com /lists/oss-security/2025/09/27/6
- openwall.com /lists/oss-security/2025/09/27/7
- openwall.com /lists/oss-security/2025/09/29/4
- openwall.com /lists/oss-security/2025/09/29/5
- openwall.com /lists/oss-security/2025/09/23/1
- openwall.com /lists/oss-security/2025/09/29/6
- openwall.com /lists/oss-security/2025/09/23/3
- openwall.com /lists/oss-security/2025/09/23/5
- openwall.com /lists/oss-security/2025/09/24/7
- openwall.com /lists/oss-security/2025/09/25/2
- openwall.com /lists/oss-security/2025/09/25/6
- openwall.com /lists/oss-security/2025/09/27/4
- openwall.com /lists/oss-security/2025/09/28/7
- openwall.com /lists/oss-security/2025/09/29/1
- cert-portal.siemens.com /productcert/html/ssa-794697.html
Sources
- CVE List CVE-2023-51767
- NVD CVE-2023-51767
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.