Vulnerability in Microsoft Exchange Server
CVE-2021-26854
Microsoft Exchange Server Remote Code Execution Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.247 (97.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.230 · newest: 0.247 · change: +0.017
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 18 — versions 15.01.0
- Microsoft Exchange Server 2016 Cumulative Update 19 — versions 15.01.0
- Microsoft Exchange Server 2019 Cumulative Update 7 — versions 15.02.0
- Microsoft Exchange Server 2019 Cumulative Update 8 — versions 15.02.0
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26854 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2021-26854?
- CVE-2021-26854 is a medium-severity vulnerability in Microsoft Exchange Server. CVSS score: 6.6/10. Published 2021-03-03.
- How severe is CVE-2021-26854?
- Medium severity. CVSS v3 base score is 6.6 out of 10.
- Is CVE-2021-26854 known to be exploited?
- 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.