What is CVE-2025-64663?

CVE-2025-64663 is a critical-severity vulnerability in Microsoft Azure Cognitive Service For Language, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.9/10. Published 2025-12-18.

How severe is CVE-2025-64663?

Critical severity. CVSS v3 base score is 9.9 out of 10.

SSRF in Microsoft Azure Cognitive Service For Language

CVE-2025-64663

Custom Question Answering Elevation of Privilege Vulnerability

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2025-12-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64663 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-64663?: CVE-2025-64663 is a critical-severity vulnerability in Microsoft Azure Cognitive Service For Language, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.9/10. Published 2025-12-18.
How severe is CVE-2025-64663?: Critical severity. CVSS v3 base score is 9.9 out of 10.