Unauthenticated service interruption via infinite loop
Published Jul 14, 2026 · Updated Jul 14, 2026
An infinite loop in Microsoft Active Directory Federation Services allows remote attackers to interrupt authentication over a network. The service's network-request processing enters a loop whose exit condition cannot be reached, but Microsoft has not disclosed the affected routine or input format. No privileges or user interaction are required, but exploitation has high complexity and can exhaust service availability without disclosing or altering data.
Summary
What happened
An infinite loop in Microsoft Active Directory Federation Services allows remote attackers to interrupt authentication over a network. The service's network-request processing enters a loop whose exit condition cannot be reached, but Microsoft has not disclosed the affected routine or input format. No privileges or user interaction are required, but exploitation has high complexity and can exhaust service availability without disclosing or altering data.
The record
- CVE
- CVE-2026-50324
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-835, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record 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.
- Affected versionversion=10.0.17763.0 <10.0.17763.9020
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.
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Technologies
Your stack
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Your stack
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