How severe is CVE-2022-23277?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2022-23277 known to be exploited?

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

Vulnerability in Microsoft Exchange Server

CVE-2022-23277

Microsoft Exchange Server Remote Code Execution Vulnerability

Published 2022-03-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.411 (98.7th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.420 · newest: 0.411 · change: -0.009

Affected products

Microsoft Exchange Server — versions 2013, 2016, 2019
Microsoft Exchange Server 2013 Cumulative Update 23 — versions 15.00.0
Microsoft Exchange Server 2016 Cumulative Update 21 — versions 15.01.0
Microsoft Exchange Server 2016 Cumulative Update 22 — versions 15.0.0
Microsoft Exchange Server 2019 Cumulative Update 10 — versions 15.02.0
Microsoft Exchange Server 2019 Cumulative Update 11 — versions 15.02.0

Public proof-of-concept exploits

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2022-23277 (vendor-advisory)

Frequently asked questions

What is CVE-2022-23277?: CVE-2022-23277 is a high-severity vulnerability in Microsoft Exchange Server. CVSS score: 8.8/10. Published 2022-03-09.
How severe is CVE-2022-23277?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2022-23277 known to be exploited?: 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.