Vulnerability in Microsoft Exchange Server
CVE-2021-26427
Microsoft Exchange Server Remote Code Execution Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
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
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-26427?
- CVE-2021-26427 is a critical-severity vulnerability in Microsoft Exchange Server. CVSS score: 9.0/10. Published 2021-10-13.
- How severe is CVE-2021-26427?
- Critical severity. CVSS v3 base score is 9.0 out of 10.