CVE-2023-42669Network attack vector

Authenticated AD DC hang via blocking RPC call

Published Nov 6, 2023 · Updated Nov 20, 2025

Denial of service in affected Samba releases allows remote authenticated users to hang an Active Directory domain controller via RPC. dcesrv_echo_TestSleep() passes a caller-selected delay to sleep() while rpcecho occupies the main RPC task's only worker. An authenticated RPC caller can therefore block essentially all AD DC services for the requested duration, while non-AD-DC or disabled-rpcecho deployments are not exposed.

CVSS severity6.5

Medium

EPSS probability1.72%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2023-42669
Published: Nov 6, 2023
Updated: Nov 20, 2025

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Classifications: CWE-400, T1499.004

Attack vector: network
Privileges: authenticated

Timeline

How it unfolded

Nov 6, 2023CVE publishedPublication date reported by the CVE source.
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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork

Required privilegesauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Red Hat · Red Hat Enterprise Linux 9.0 Extended Update SupportAffected versions are unavailable in this record.

Red Hat · Red Hat Enterprise Linux 9.2 Extended Update SupportAffected versions are unavailable in this record.

PPP Project · Sambaversion=4.0.0 <4.17.12; version=4.18.0 <4.18.8; version=4.19.0

Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Red Hat · Red Hat Enterprise Linux 8.8 Extended Update SupportAffected versions are unavailable in this record.

Red Hat · Red Hat Enterprise Linux 8.6 Extended Update SupportAffected versions are unavailable in this record.

Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

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

6.5NISTCVSS: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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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