CVE-2022-0336Network attack vector

Service impersonation via skipped SPN conflict checks

Published Aug 29, 2022 · Updated Aug 2, 2024

Improper access control in affected Samba AD DC releases allows remote authenticated users to impersonate services or interrupt them. The samldb SPN update path returns early when an added SPN already exists on the same account, skipping conflict checks for later values. Account-write permission is required; a conflicting SPN can deny an existing service, while intercepted traffic loses confidentiality and integrity through service impersonation.

CVSS severity8.8
High
EPSS probability1.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected Samba AD DC releases allows remote authenticated users to impersonate services or interrupt them. The samldb SPN update path returns early when an added SPN already exists on the same account, skipping conflict checks for later values. Account-write permission is required; a conflicting SPN can deny an existing service, while intercepted traffic loses confidentiality and integrity through service impersonation.

The record

CVE
CVE-2022-0336
Published
Aug 29, 2022
Updated
Aug 2, 2024
Vendor
PPP Project
Product
Samba
Classifications
CWE-276, T1557
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=Affects Samba v4.0.0 and later, Fixed in samba v4.13.17, v4.14.12, v4.15.4.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PPP Project · Sambaversion=Affects Samba v4.0.0 and later, Fixed in samba v4.13.17, v4.14.12, v4.15.4.

Published CVSS scores

8.8Samba TeamCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-276Incorrect Default Permissions
T1557Adversary-in-the-Middle

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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