What is CVE-2025-21384?

CVE-2025-21384 is a high-severity vulnerability in Microsoft Azure Health Bot, classified under Protection Mechanism Failure. CVSS score: 8.3/10. Published 2025-04-01.

How severe is CVE-2025-21384?

High severity. CVSS v3 base score is 8.3 out of 10.

Is CVE-2025-21384 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SSRF in Microsoft Azure Health Bot

CVE-2025-21384

An authenticated attacker can exploit an Server-Side Request Forgery (SSRF) vulnerability in Microsoft Azure Health Bot to elevate privileges over a network.

Published 2025-04-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.007 (50.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.4% 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)

Public proof-of-concept exploits

ghostbyt3/patch-tuesday

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21384 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-21384?: CVE-2025-21384 is a high-severity vulnerability in Microsoft Azure Health Bot, classified under Protection Mechanism Failure. CVSS score: 8.3/10. Published 2025-04-01.
How severe is CVE-2025-21384?: High severity. CVSS v3 base score is 8.3 out of 10.
Is CVE-2025-21384 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.