CVE-2023-21761

Name: CVE-2023-21761
Creator: NVD / NIST
Published: 2023-01-10T22:15:18.927+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.59%

Last modified Jun 17, 2026

CVE-2023-21761 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Microsoft Exchange Server Information Disclosure Vulnerability. EPSS estimates a 1.59% chance of exploitation in the next 30 days.

Description

Microsoft Exchange Server Information Disclosure Vulnerability

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.59%

72.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions	Update
Microsoft	Exchange Server	2016	Cumulative Update 23
Microsoft	Exchange Server	2019	Cumulative Update 11

References

Timeline

Published: Jan 10, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-21761?

Microsoft Exchange Server Information Disclosure Vulnerability

How severe is CVE-2023-21761?

CVE-2023-21761 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.59% probability of exploitation in the next 30 days.

How do I fix CVE-2023-21761?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-21761?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST