What is CVE-2025-64657?

CVE-2025-64657 is a critical-severity vulnerability in Microsoft Azure App Gateway, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2025-11-26.

How severe is CVE-2025-64657?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Microsoft Azure App Gateway

CVE-2025-64657

Stack-based buffer overflow in Azure Application Gateway allows an unauthorized attacker to elevate privileges over a network.

Vulnerability class: Buffer Overflow

EPSS: 0.006 (45.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Azure App Gateway
Microsoft Azure_application_gateway

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64657?: CVE-2025-64657 is a critical-severity vulnerability in Microsoft Azure App Gateway, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2025-11-26.
How severe is CVE-2025-64657?: Critical severity. CVSS v3 base score is 9.8 out of 10.