CVE-2026-66802: Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability

highCVSS 8.1CVE-2026-66802

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Azure Attestation service and Device Health Attestation Service allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoft product: Azure Attestation / Device Health Attestation Service Remote code execution

What: A race condition in Azure Attestation and Device Health Attestation Service allows remote code execution through concurrent access to shared resources.
Who is affected: Systems running Microsoft Azure Attestation or Device Health Attestation Service exposed to network access are affected.
Urgency: High urgency; CVSS 8.1 critical severity remote code execution vulnerability with no authentication required.
Action: Apply security patches for Azure Attestation and Device Health Attestation Service immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.1
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66802

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-668020.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66802	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Device Health

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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