Vulnerability in Microsoft Exchange Server
CVE-2021-28481
Microsoft Exchange Server Remote Code Execution Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.362 (98.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.365 · newest: 0.362 · change: -0.002
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 19 — versions 15.01.0
- Microsoft Exchange Server 2016 Cumulative Update 20 — versions 15.01.0
- Microsoft Exchange Server 2019 Cumulative Update 8 — versions 15.02.0
- Microsoft Exchange Server 2019 Cumulative Update 9 — versions 15.02.0
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28481 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-28481?
- CVE-2021-28481 is a critical-severity vulnerability in Microsoft Exchange Server. CVSS score: 9.8/10. Published 2021-04-13.
- How severe is CVE-2021-28481?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-28481 known to be exploited?
- 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.