Vulnerability in Microsoft Exchange Server
CVE-2021-31195
Microsoft Exchange Server Remote Code Execution Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.737 (99.5th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.737 · newest: 0.737 · 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 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
Weakness classification (CWE)
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31195 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-31195?
- CVE-2021-31195 is a medium-severity vulnerability in Microsoft Exchange Server, classified under Authentication Bypass by Spoofing. CVSS score: 6.5/10. Published 2021-05-11.
- How severe is CVE-2021-31195?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-31195 known to be exploited?
- 22 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.