CVE-2023-42670

MEDIUM 6.5

Samba: ad dc busy rpc multiple listener dos

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners can be initiated, causing disruptions in the AD DC service. When Samba's RPC server experiences a high load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation "classic DCs") can erroneously start and compete for the same unix domain sockets. This issue leads to partial query responses from the AD DC, causing issues such as "The procedure number is out of range" when using tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services.

CWE	CWE-400
Published	Nov 3, 2023
Last Updated	Nov 20, 2025

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

Red Hat / Red Hat Enterprise Linux 7

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Storage 3

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-42670 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2241885 bugzilla.samba.org: https://bugzilla.samba.org/show_bug.cgi?id=15473 samba.org: https://www.samba.org/samba/security/CVE-2023-42670.html lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/ security.netapp.com: https://security.netapp.com/advisory/ntap-20231124-0002/