CVE-2023-42670

Name: CVE-2023-42670
Creator: NVD / NIST
Published: 2023-11-03T08:15:07.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.10%

Last modified Jun 17, 2026

CVE-2023-42670 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.10% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.10%

61.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Samba	Samba	< 4.17.12
Samba	Samba	>= 4.18.0, < 4.18.8
Samba	Samba	>= 4.19.0, < 4.19.1
Fedoraproject	Fedora	39

References

https://access.redhat.com/security/cve/CVE-2023-42670Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2241885Issue Tracking
https://bugzilla.samba.org/show_bug.cgi?id=15473Issue Tracking
https://www.samba.org/samba/security/CVE-2023-42670.htmlVendor Advisory
https://access.redhat.com/security/cve/CVE-2023-42670Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2241885Issue Tracking
https://bugzilla.samba.org/show_bug.cgi?id=15473Issue Tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZUMVALLFFDFC53JZMUWA6HPD7HUGAP5I/
https://security.netapp.com/advisory/ntap-20231124-0002/
https://www.samba.org/samba/security/CVE-2023-42670.htmlVendor Advisory

Timeline

Published: Nov 3, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-42670?

How severe is CVE-2023-42670?

CVE-2023-42670 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.10% probability of exploitation in the next 30 days.

How do I fix CVE-2023-42670?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-42670?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST