What is CVE-2023-21761?

CVE-2023-21761 is a high-severity vulnerability in Microsoft Exchange Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2023-01-10.

How severe is CVE-2023-21761?

High severity. CVSS v3 base score is 7.5 out of 10.

SSRF in Microsoft Exchange Server

CVE-2023-21761

Microsoft Exchange Server Information Disclosure Vulnerability

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.016 (73.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Microsoft Exchange_server — versions 2016, 2019
Microsoft Exchange Server 2016 Cumulative Update 23 — versions 15.01.0
Microsoft Exchange Server 2019 Cumulative Update 11 — versions 15.02.0
Microsoft Exchange Server 2019 Cumulative Update 12 — versions 15.02.0

Weakness classification (CWE)

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

References

secure@microsoft.com (vendor-advisory)

Frequently asked questions

What is CVE-2023-21761?: CVE-2023-21761 is a high-severity vulnerability in Microsoft Exchange Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2023-01-10.
How severe is CVE-2023-21761?: High severity. CVSS v3 base score is 7.5 out of 10.