Unauthenticated service interruption through AF_UNIX socket provider
Published Jul 14, 2021 · Updated Aug 10, 2026
Denial of service in Microsoft Windows AF_UNIX Socket Provider allows remote attackers to interrupt affected systems over a network. Microsoft has not published the malformed socket operation or provider code path that triggers the failure. No authentication or user interaction is required; the record establishes complete availability loss but does not distinguish a hang, crash, or reboot.
Summary
What happened
Denial of service in Microsoft Windows AF_UNIX Socket Provider allows remote attackers to interrupt affected systems over a network. Microsoft has not published the malformed socket operation or provider code path that triggers the failure. No authentication or user interaction is required; the record establishes complete availability loss but does not distinguish a hang, crash, or reboot.
The record
- CVE
- CVE-2021-33785
- Published
- Jul 14, 2021
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2021CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.2061
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo