CVE-2026-71331
Summary
by MITRE • 08/11/2026
Integer overflow or wraparound in Microsoft Azure Attestation service and Device Health Attestation Service allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/11/2026
The vulnerability described represents a critical integer overflow condition that affects Microsoft Azure Attestation service and Device Health Attestation Service implementations. This type of flaw falls under the common weakness enumeration CWE-190, which specifically addresses integer overflow conditions where arithmetic operations produce results that exceed the maximum value representable by the target data type. The vulnerability manifests when the system processes integer values that exceed their allocated bit width, causing the value to wrap around to a much smaller number or zero, creating potential exploitation opportunities for malicious actors.
The technical execution of this vulnerability occurs within the attestation service's processing logic where unsigned integers are manipulated during validation procedures. When an attacker crafts malformed input data containing excessively large integer values, the system's arithmetic operations fail to properly validate these inputs against their respective maximum limits. This failure enables attackers to manipulate the program flow through controlled overflow conditions that can lead to memory corruption or unexpected behavior in the service's execution path. The issue is particularly dangerous because it occurs within attestation services that are designed to verify device integrity and trust relationships, making successful exploitation potentially devastating for security infrastructure.
The operational impact of this vulnerability extends beyond simple code execution capabilities as it undermines the fundamental trust model that attestation services maintain. Attackers can leverage this integer wraparound to bypass authentication mechanisms, manipulate validation results, or inject malicious payloads into the service processing pipeline. The network-based nature of exploitation means that adversaries do not require physical access to target systems, enabling remote attacks that could compromise entire device fleets managed through Azure Attestation. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 for command and control execution and potentially T1210 for exploitation of remote services.
Mitigation strategies should focus on implementing comprehensive input validation and integer overflow protection mechanisms throughout the affected service components. Organizations must ensure that all integer operations within attestation processing logic include proper bounds checking and use safe arithmetic functions that can detect and prevent overflow conditions before they occur. The implementation of defensive programming practices including explicit type checking, use of bounded integer types, and runtime validation of input parameters represents essential protective measures. Additionally, Microsoft should implement automatic patching mechanisms for the Azure Attestation service and Device Health Attestation Service to ensure rapid remediation across all affected deployments. Security monitoring should include detection of anomalous integer value patterns in attestation requests that could indicate attempted exploitation attempts.