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Microsoft Azure Attestation service and Device Health Attestation Service

CVE-2026-71331 — Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability

Critical CVSS 8.1 EPSS 0.00454 2026-08 archive

Executive Summary

Integer overflow or wraparound in Microsoft Azure Attestation service and Device Health Attestation Service allows an unauthorized attacker to execute code over a network.

Overview

8.1
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released Aug 11 2026
Last Updated Aug 11 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00454 — 0.3757 percentile
NVD CVSS 8.1 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.1

EPSS Score

0.00454
probability of exploitation in the next 30 days
0.3757 percentile - updated 2026-08-14
View on FIRST.org

Affected Products

6 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1809 for 32-bit Systems 5120238 (Security Update) Critical Remote Code Execution Yes
Windows 10 Version 1809 for x64-based Systems 5120238 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 5120238 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 5120238 (Security Update) Critical Remote Code Execution Yes
Windows Server 2022 5120242 (Security Update) 5120229 (Security Hotpatch Update) Critical Remote Code Execution 5082142 Base: 8.1 Temporal: 7.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.5499 10.0.20348.5440 Yes None Windows Server 2022 (Server Core installation) 5120242 (Security Update) 5120229 (Security Hotpatch Update) Critical Remote Code Execution 5082142 Base: 8.1 Temporal: 7.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.5499 10.0.20348.5440 Yes None Windows Server 2025 5120233 (Security Update) Critical Remote Code Execution Yes
Windows Server 2025 (Server Core installation) 5120233 (Security Update) Critical Remote Code Execution Yes

Patches

2 patches
Article Type Restart
5120238 Security Update Yes
5120233 Security Update Yes

Known Exploits

Acknowledgments

Anonymous

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