CVE-2022-21979: 
vulnerability analysis and mitigation

Microsoft Exchange Server Information Disclosure Vulnerability (CVE-2022-21979) was disclosed and addressed in Microsoft's August 2022 security updates. This vulnerability affects multiple versions of Microsoft Exchange Server including Exchange Server 2013 (Cumulative Update 11), Exchange Server 2016 (Cumulative Update 22 and 23), and Exchange Server 2019 (Cumulative Update 11 and 12) (NVD).

The vulnerability has been assigned a CVSS v3.1 base score of 5.7 (Medium) by NIST with a vector string of CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N. Microsoft's assessment differs slightly with a CVSS score of 4.8 (Medium) and vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N (NVD).

This vulnerability could allow information disclosure if successfully exploited. The attack requires user interaction and authenticated access, but could potentially lead to the exposure of sensitive information (Microsoft Update Guide).

Microsoft has released security updates to address this vulnerability as part of the August 2022 security updates. The fixes are available through Microsoft Update, Microsoft Update Catalog, and Microsoft Download Center for affected versions of Exchange Server (Microsoft Support).