Vulnerability in Microsoft Exchange Server
CVE-2021-31209
Microsoft Exchange Server Spoofing Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.026 (84.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · 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)
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31209 (Patch, Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-615/ (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31209?
- CVE-2021-31209 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-2021-31209?
- Medium severity. CVSS v3 base score is 6.5 out of 10.