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CVE-2023-51384

MEDIUM 5.5 ALL-YEARS

Published 2023-12-18 · Last modified 2026-10-15 · mitre · NVD: Modified

In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.

LIMITED SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 37th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

5.5CVSS 3.1 · MEDIUM · ADP

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Siemens Openbsd Debian

Products Simatic S7 1500 Cpu 1518 4 Pn/Dp Mfp Simatic S7 1500 Cpu 1518f 4 Pn/Dp Mfp Simatic S7 1500 Tm Mfp Gnu/Linux Subsystem Siplus S7 1500 Cpu 1518 4 Pn/Dp Mfp Openssh Debian Linux

Weakness (CWE)

  • CWE-284: Improper Access Control

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References and research data (JSON)

Vendor product assessments

Showing 32 of 33 vendor product statements; 1 omitted. Read the full vendor advisory.

  • openssh as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-askpass as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-askpass

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-clients as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-clients

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-ldap as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-ldap

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-server as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-server

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh.src as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh?arch=src

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/pam_ssh_agent_auth

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-askpass as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-askpass

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-cavs as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-cavs

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-clients as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-clients

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-keycat as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-keycat

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-ldap as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-ldap

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-server as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-server

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-server-sysvinit as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-server-sysvinit

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh.src as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh?arch=src

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-askpass as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-askpass

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-cavs as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-cavs

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-clients as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-clients

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-keycat as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-keycat

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-ldap as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-ldap

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-server as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-server

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh.src as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh?arch=src

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/pam_ssh_agent_auth

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-askpass as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-askpass

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-clients as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-clients

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-keycat as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-keycat

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh-server as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh-server

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • openssh.src as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/openssh?arch=src

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00
  • pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/pam_ssh_agent_auth

    Red Hat · CVE-2023-51384 · Updated 2026-05-28T21:12:59+00:00

Known Affected Software Configurations

VendorProductVersion range
OpenbsdOpenssh≥ 8.9 and < 9.6
DebianDebian Linux11.0
DebianDebian Linux12.0

All CVSS metrics

  • MEDIUM 5.5 v3.1 · ADP Primary
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
  • MEDIUM 5.5 v3.1 · NVD Primary
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS