Microsoft Azure Attestation and Device Health Attestation: Information disclosure via out-of-bounds read
Summary
An out-of-bounds read in the Microsoft Azure Attestation service and the Device Health Attestation (DHA) service allows an unauthenticated remote attacker to read memory and disclose information. The attack requires no privileges and no user interaction, and the impact is limited to confidentiality. The CVSS score is 7.5, but the CISA SSVC data reports no known exploitation and the EPSS score is low.
Affected
- Windows Server 2019 (including Server Core): 10.0.17763.0 before 10.0.17763.9376
- Windows Server 2022: 10.0.20348.0 before 10.0.20348.5761
- Windows Server 2025 (including Server Core): 10.0.26100.0 before 10.0.26100.33650
- Azure-hosted Attestation instances: Unknown.
Fixed in
- October 2026 cumulative updates for the listed Windows Server builds (per Tenable plugin pages: KB5126646 for Windows Server 2025, KB5126651 for Windows Server 2019, KB5126655 for Windows Server 2022). Verify against the MSRC advisory.
- Azure Attestation: Unknown.
Workaround
- Unknown. No vendor-documented mitigation was found.
- Where patching is delayed, restrict network access to the affected DHA or Attestation endpoints.
Exploitation
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- Not listed in CISA KEV.
- No public proof of concept found for this CVE.
- EPSS score 0.00966 (low).
Our recommendation
- Apply the October 2026 cumulative update to all affected Windows Server systems.
- Verify the installed build numbers against the MSRC advisory.
- Confirm that no DHA endpoints are reachable from the internet.
- Review any use of Azure Attestation in your tenant.
- Treat this update as a priority, since the related CVE-2026-71331 (critical RCE in the same component) was also reported.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – Microsoft Azure Attestation service and Device Health Attestation Service
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows
- Updates (KB)
- KB5126651, KB5126655, KB5126646
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- MSRC Security Update Guide msrc.microsoft.com
- OpenCVE CVE-2026-69454 app.opencve.io
- Vulners NVD CVE-2026-69454 vulners.com
- Tenable plugin 365473 (Windows Server 2025) www.tenable.com
- Tenable plugin 365475 (Windows Server 2019) www.tenable.com
- Tenable plugin 365470 (Windows Server 2022) www.tenable.com
- Microsoft Learn: Azure Attestation overview learn.microsoft.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 19:28.
Original description (NVD)
Out-of-bounds read in Microsoft Azure Attestation service and Device Health Attestation Service allows an unauthorized attacker to disclose information over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
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