Authentication coercion via unchecked Server service RPC
Published Jul 12, 2022 · Updated Jul 8, 2025
Authentication coercion in Microsoft Windows Server service allows remote authenticated users to relay a machine account's NTLM credentials. The srvsvc security callback omits LocalrServerCertificateMappingModify from its restricted operation range, allowing a remote RPC caller to supply a UNC certificate-store path that triggers authentication to an attacker-controlled host. Access to a domain machine is required, and domain-controller code execution additionally requires an NTLM-relayable Active Directory Certificate Services endpoint.
Summary
What happened
Authentication coercion in Microsoft Windows Server service allows remote authenticated users to relay a machine account's NTLM credentials. The srvsvc security callback omits LocalrServerCertificateMappingModify from its restricted operation range, allowing a remote RPC caller to supply a UNC certificate-store path that triggers authentication to an attacker-controlled host. Access to a domain machine is required, and domain-controller code execution additionally requires an NTLM-relayable Active Directory Certificate Services endpoint.
The record
- CVE
- CVE-2022-30216
- Published
- Jul 12, 2022
- Updated
- Jul 8, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 21H1
- Classifications
- CWE-434, T1187
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 12, 2022CVE publishedPublication date reported by the CVE source.
- Jul 8, 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?
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- Affected versionversion=10.0.0 <10.0.19043.1826
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- CVE-2022-30216 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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