CVE-2023-42670Network attack vector

AD DC disruption via competing RPC listeners

Published Nov 3, 2023 · Updated Nov 20, 2025

Denial of service in Samba allows remote authenticated users to disrupt Active Directory domain controller RPC service over the network. Under load or unresponsiveness, samba-dcerpcd fails to suppress non-AD-DC RPC services, starts incompatible listeners, and competes for the AD DC's Unix domain sockets. A low-privileged authenticated client can trigger mixed partial RPC responses that prevent reliable AD DC queries without affecting confidentiality or integrity.

CVSS severity6.5
Medium
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Samba allows remote authenticated users to disrupt Active Directory domain controller RPC service over the network. Under load or unresponsiveness, samba-dcerpcd fails to suppress non-AD-DC RPC services, starts incompatible listeners, and competes for the AD DC's Unix domain sockets. A low-privileged authenticated client can trigger mixed partial RPC responses that prevent reliable AD DC queries without affecting confidentiality or integrity.

The record

CVE
CVE-2023-42670
Published
Nov 3, 2023
Updated
Nov 20, 2025
Vendor
PPP Project
Product
Samba
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.16.0 <4.17.12
  2. Affected versionversion=4.18.0 <4.18.8
  3. Affected versionversion=4.19.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PPP Project · Sambaversion=4.16.0 <4.17.12; version=4.18.0 <4.18.8; version=4.19.0

Published CVSS scores

6.5Samba TeamCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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