CVE-2023-51767
OpenSSH through 9.6, when common types of DRAM are used, might allow row hammer attacks (for...
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."
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
7.0
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."
- Record
CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
CVE List
7.0
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."
- Record
CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
EUVDEUVD-2023-56456
7.0
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."
- Record
EUVD-2023-56456- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-27q9-h529-q4g3
7.0
OpenSSH through 9.6, when common types of DRAM are used, might allow row hammer attacks (for...
OpenSSH through 9.6, 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.
- Record
GHSA-27q9-h529-q4g3- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVALPINE-CVE-2023-51767
7.0
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."
- Record
ALPINE-CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSV
7.0
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."
- Record
CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 4 moreShow less
OSVRHSA-2026:9221
7.0
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- Record
RHSA-2026:9221- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVROOT-OS-DEBIAN-11-CVE-2023-51767
7.0
CVE-2023-51767 in openssh - Patched by Root
Root has patched CVE-2023-51767 in the openssh package for Root:Debian:11. Multiple fixed versions available.
- Record
ROOT-OS-DEBIAN-11-CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVROOT-OS-DEBIAN-12-CVE-2023-51767
7.0
CVE-2023-51767 in openssh - Patched by Root
Root has patched CVE-2023-51767 in the openssh package for Root:Debian:12. Multiple fixed versions available.
- Record
ROOT-OS-DEBIAN-12-CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2023-51767
7.0
OpenSSH through 9.6, 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.
- Record
UBUNTU-CVE-2023-51767- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
opensshAlpine:v3.19 |
before 9.7_p1-r0 | 9.7_p1-r0 |
opensshAlpine:v3.20 |
before 9.7_p1-r0 | 9.7_p1-r0 |
opensshAlpine:v3.21 |
before 9.7_p1-r0 | 9.7_p1-r0 |
opensshAlpine:v3.22 |
before 9.7_p1-r0 | 9.7_p1-r0 |
opensshAlpine:v3.23 |
before 9.7_p1-r0 | 9.7_p1-r0 |
opensshAlpine:v3.24 |
before 9.7_p1-r0 | 9.7_p1-r0 |
opensshRoot:Debian:11 |
before 1:8.4p1-5+deb11u7.root.io.9 | 1:8.4p1-5+deb11u7.root.io.91:8.4p1-5+deb11u7.aikido.101:8.4p1-5+deb11u7.aikido.11 |
rootio-opensshRoot:Debian:11 |
before 1:8.4p1-5+deb11u7.root.io.9 | 1:8.4p1-5+deb11u7.root.io.91:8.4p1-5+deb11u7.aikido.101:8.4p1-5+deb11u7.aikido.11 |
opensshRoot:Debian:12 |
before 1:9.2p1-2+deb12u10.root.io.11 | 1:9.2p1-2+deb12u10.root.io.111:9.2p1-2+deb12u10.aikido.141:9.2p1-2+deb12u10.root.io.131:9.2p1-2+deb12u10.root.io.121:9.2p1-2+deb12u10.aikido.151:9.2p1-2+deb12u10.aikido.16 |
rootio-opensshRoot:Debian:12 |
before 1:9.2p1-2+deb12u10.root.io.11 | 1:9.2p1-2+deb12u10.root.io.111:9.2p1-2+deb12u10.aikido.141:9.2p1-2+deb12u10.root.io.131:9.2p1-2+deb12u10.root.io.121:9.2p1-2+deb12u10.aikido.151:9.2p1-2+deb12u10.aikido.16 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-51767 is a high vulnerability (CVSS 7.0) in Openbsd Openssh, published December 24, 2023. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 51st percentile. Fixed in openssh 9.7_p1-r0.
References
arxiv.org/abs/2309.02545
github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/monitor.c
github.com/openssh/openssh-portable/blob/8241b9c0529228b4b86d88b1a6076fb9f97e4a99/auth-passwd.c
bugzilla.redhat.com/show_bug.cgi?id=2255850
access.redhat.com/security/cve/CVE-2023-51767
ubuntu.com/security/CVE-2023-51767
Show 37 moreShow less
security.netapp.com/advisory/ntap-20240125-0006
openwall.com/lists/oss-security/2025/09/22/1
openwall.com/lists/oss-security/2025/10/01/1
openwall.com/lists/oss-security/2025/09/24/4
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
nvd.nist.gov/vuln/detail/CVE-2023-51767
github.com/advisories/GHSA-27q9-h529-q4g3
security.alpinelinux.org/vuln/CVE-2023-51767
github.com/CVEProject/cvelistV5/tree/main/cves/2023/51xxx/CVE-2023-51767.json
access.redhat.com/errata/RHSA-2026:9221
images.redhat.com
access.redhat.com/security/updates/classification
security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_9221.json
cve.org/CVERecord?id=CVE-2023-51767