What is CVE-2025-40776?

CVE-2025-40776 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Birthday Attack against Resolvers supporting ECS

Which CVE IDs does CVE-2025-40776 cover?

CVE-2025-40776 covers the following CVE IDs: CVE-2025-40776. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-40776?

CVE-2025-40776 has a CVSS v3 base score of 8.6, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-40776?

CVE-2025-40776 affects 2 products, including: azl3 bind 9.20.9-1 on Azure Linux 3.0; cbl2 bind 9.16.50-1.

CVE-2025-40776HighCVSS 8.6

Birthday Attack against Resolvers supporting ECS

Vendor

Microsoft Security Response Center (MSRC)

Published

August 7, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2025-40776 →

🎯 Affected products2

azl3 bind 9.20.9-1 on Azure Linux 3.0
cbl2 bind 9.16.50-1

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40776