Evidence used
- No CISA KEV confirmation is currently recorded.
- Exploitation requires an existing local or physical foothold with privileges.
- EPSS is 0.66% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2023
CVE-2023-51767High confidence
n/a — security vulnerability
Unknown · Unknown
Official source article: Siemens SSA-794697 ↗. Check the applicable product and release in the original source.
7.0HighCVSS 3.1
Patch only the product branches with a verified fix
Fix availability varies by productHigh technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 51 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:Medium, lowered one band.downgradedsince 2 Jun 2026
Compensating controls
- Apply the linked authoritative mitigation while planning the permanent fix.
- Restrict local access and enforce least privilege on affected hosts.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Unknown Unknown and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Remediation availability differs by product scope
Verified remediation exists for at least one product or source, but 51 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
- Red Hat Product Security: 34 affected or under-investigation product states without a fixed product state in the same current advisory
- Stackable Product Security Team: 16 affected or under-investigation product states without a fixed product state in the same current advisory
- Siemens ProductCERT: 1 affected or under-investigation product state without a fixed product state in the same current advisory
Distribution package intelligence
3 package statesRelease-specific package status
Alpine findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Alpine v3.23v3.23 · main | openssh | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 9.7_p1-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.22v3.22 · main | openssh | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 9.7_p1-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
| Alpine v3.21v3.21 · main | openssh | Vendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected. | 9.7_p1-r0 | Alpine Security Database ↗Source updated 3 Oct 2026 |
Direct vendor intelligence
5 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2023-51767 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityopenssh: authentication bypass via row hammer attack
The vendor explicitly identifies these products as affected by this CVE.
- openssh as a component of Red Hat Enterprise Linux 6
- openssh-askpass as a component of Red Hat Enterprise Linux 6
- openssh-clients as a component of Red Hat Enterprise Linux 6
- openssh-ldap as a component of Red Hat Enterprise Linux 6
- openssh-server as a component of Red Hat Enterprise Linux 6
- openssh.src as a component of Red Hat Enterprise Linux 6
- pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 6
- openssh as a component of Red Hat Enterprise Linux 7
- openssh-askpass as a component of Red Hat Enterprise Linux 7
- openssh-cavs as a component of Red Hat Enterprise Linux 7
- openssh-clients as a component of Red Hat Enterprise Linux 7
- openssh-keycat as a component of Red Hat Enterprise Linux 7
- Summary
- An authentication bypass vulnerability was found in a modified version of OpenSSH. When common types of DRAM memory are used, it might allow row hammer attacks because the integer value of authenticated authpassword does not resist flips of a single bit. Exploiting a Rowhammer-style attack to flip bits in memory, forces successful authentication by setting the return code to 0.
- Remediation
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. There is no upstream solution. Changing the success code logic would break system behavior. Since Rowhammer exploits physical DRAM faults, software-level fixes are ineffective, and no mitigation will be pursued.
SCA-2025-0011 · CSAF 2.0 · revision 1.0.0 · finalSICK PSIRTVulnerabilities affecting Endress+Hauser SSG-E210GC
The vendor explicitly states that these products are not affected by this CVE.
- Endress+Hauser SSG-E210GC all Firmware versions
- Summary
- 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.
- Remediation
- No remediation text is recorded.
SCA-2025-0009 · CSAF 2.0 · revision 1 · finalSICK PSIRTVulnerabilities affecting SICK TDC-E210GC
The vendor explicitly states that these products are not affected by this CVE.
- SICK TDC-E210GC all Firmware versions
- Summary
- 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.
- Remediation
- No remediation text is recorded.
STACKSA_2024_0101_0001 · CSAF 2.0 · revision 1 · finalStackable Product Security TeamStackable Security Advisory for: CVE-2023-51767
The vendor explicitly identifies these products as affected by this CVE.
- openssh:8.7p1-38.el9_4.4@airflow:2.6.3-stackable24.7.0-amd64
- openssh-clients:8.7p1-38.el9_4.4@airflow:2.6.3-stackable24.7.0-amd64
- openssh:8.7p1-38.el9_4.4@airflow:2.8.1-stackable24.7.0-amd64
- openssh-clients:8.7p1-38.el9_4.4@airflow:2.8.1-stackable24.7.0-amd64
- openssh:8.7p1-38.el9_4.4@airflow:2.8.4-stackable24.7.0-amd64
- openssh-clients:8.7p1-38.el9_4.4@airflow:2.8.4-stackable24.7.0-amd64
- openssh:8.7p1-38.el9_4.4@airflow:2.9.2-stackable24.7.0-amd64
- openssh-clients:8.7p1-38.el9_4.4@airflow:2.9.2-stackable24.7.0-amd64
- openssh-clients:8.7p1-38.el9_4.4@airflow:2.6.3-stackable24.7.0-arm64
- openssh:8.7p1-38.el9_4.4@airflow:2.6.3-stackable24.7.0-arm64
- openssh-clients:8.7p1-38.el9_4.4@airflow:2.8.1-stackable24.7.0-arm64
- openssh:8.7p1-38.el9_4.4@airflow:2.8.1-stackable24.7.0-arm64
- Summary
- An authentication bypass vulnerability was found in OpenSSH. When common types of DRAM memory are used, it might allow row hammer attacks because the integer value of authenticated authpassword does not resist flips of a single bit.
- Remediation
- We took a look at the Airflow Dockerfile to determine why OpenSSH was installed. The OpenSSH client is used for cloning DAG repositories in Airflow pods. It runs in its own container (git-sync). We read the Red Hat statement for this vulnerability. Red Hat classifies this vulnerability as "moderate", because it only affects the local system. We agree with that. We can't install a newer OpenSSH client because Red Hat does currently not provide a newer version for UBI 9. OpenSSH >9.6 does not seem to be affected, at least only versions until 9.6 are listed as affected by the NVD.
SSA-794697 · CSAF 2.0 · revision 9 · interimSiemens ProductCERTSSA-794697: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP before V1.1
The vendor explicitly identifies these products as affected by this CVE.
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Summary
- 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.
- Remediation
- Update to V1.1 or later version
High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 51 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product01
What, why and how
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."
What
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."
Why
The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may bypass an access boundary or take over an account.
What
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."
Why
The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may bypass an access boundary or take over an account.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- local access → vulnerable operation → bypass an access boundary or take over an account
- Attack surface
- Local
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- High: exploitation depends on specific conditions
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration. - CWE not yet assigned
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix availability varies by product
- Affected
- openssh as a component of Red Hat Enterprise Linux 6
- openssh-askpass as a component of Red Hat Enterprise Linux 6
- openssh-clients as a component of Red Hat Enterprise Linux 6
- openssh-ldap as a component of Red Hat Enterprise Linux 6
- openssh-server as a component of Red Hat Enterprise Linux 6
- openssh.src as a component of Red Hat Enterprise Linux 6
- pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 6
- openssh as a component of Red Hat Enterprise Linux 7
- openssh-askpass as a component of Red Hat Enterprise Linux 7
- openssh-cavs as a component of Red Hat Enterprise Linux 7
- openssh-clients as a component of Red Hat Enterprise Linux 7
- openssh-keycat as a component of Red Hat Enterprise Linux 7
- openssh-ldap as a component of Red Hat Enterprise Linux 7
- openssh-server as a component of Red Hat Enterprise Linux 7
- openssh-server-sysvinit as a component of Red Hat Enterprise Linux 7
- openssh.src as a component of Red Hat Enterprise Linux 7
- pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 7
- openssh as a component of Red Hat Enterprise Linux 8
- openssh-askpass as a component of Red Hat Enterprise Linux 8
- openssh-cavs as a component of Red Hat Enterprise Linux 8
- openssh-clients as a component of Red Hat Enterprise Linux 8
- openssh-keycat as a component of Red Hat Enterprise Linux 8
- openssh-ldap as a component of Red Hat Enterprise Linux 8
- openssh-server as a component of Red Hat Enterprise Linux 8
- openssh.src as a component of Red Hat Enterprise Linux 8
- pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 8
- openssh as a component of Red Hat Enterprise Linux 9
- openssh-askpass as a component of Red Hat Enterprise Linux 9
- openssh-clients as a component of Red Hat Enterprise Linux 9
- openssh-keycat as a component of Red Hat Enterprise Linux 9
- and 4 more
- Action
- Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
- Workaround
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. There is no upstream solution. Changing the success code logic would break system behavior. Since Rowhammer exploits physical DRAM faults, software-level fixes are ineffective, and no mitigation will be pursued.
04
Evidence and provenance
Published 24 Dec 2023 · Last source change 2 Jun 2026, 15:08 UTC · CWE not yet assigned
CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source FIRST · tracked since 2026-08-14
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2023-56456
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceUnavailable
NVD statusNVD modified after enrichment
Missing structured fields: CWE classification, affected product. Missing data is not evidence of low risk; review the primary advisory.
Material change intelligence
View recent updates ↗What changed after publication
- Vendor guidanceAuthoritative vendor guidance changed: added remediation: sick.com/sca-2025-0011.json; removed remediation: endress.com.SICK PSIRT ↗
- Before
- remediation: endress.com
- After
- remediation: sick.com/sca-2025-0011.json
- Vendor guidanceAuthoritative vendor guidance changed: added remediation: sick.com/special_information_sick_operating_guidelines_cybersecurity_by_sick_en_im0106719.pdf; removed remediation: sick.com/psirt.SICK PSIRT ↗
- Before
- remediation: sick.com/psirt
- After
- remediation: sick.com/special_information_sick_operating_guidelines_cybersecurity_by_sick_en_im0106719.pdf
- Remediation statusRemediation status changed from Awaiting fix to Mitigation available.Siemens ProductCERT ↗
- Before
- Awaiting fix
- After
- Mitigation available
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.