EUVD-2026-56771
GHSA-3x7g-gfm7-3w86
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable, unauthenticated RCE with full impact; AC:H reflects the precision required to exploit integer overflow into reliable heap corruption.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Microsoft Azure Attestation service and Device Health Attestation Service allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution affects Microsoft Azure Attestation service and Device Health Attestation Service via an integer overflow condition that leads to a heap-based buffer overflow (CWE-122). Unauthenticated network attackers can exploit this flaw - confirmed by PR:N in the CVSS vector - though the high attack complexity (AC:H) indicates precise exploitation conditions must be met. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to either the Azure Attestation cloud endpoint or the Device Health Attestation Service endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.1 (High) reflects a network-reachable, unauthenticated RCE with C:H/I:H/A:H impact - a severe outcome - tempered by AC:H (high attack complexity), which materially reduces exploitability in opportunistic scenarios. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the patch or update referenced in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71331. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Azure Attestation and Device Health Attestation deployments in your environment and enable detailed audit logging on these services. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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