Vulnerability in Microsoft Exchange Server
CVE-2021-42305
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:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.079 (94.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.079 · newest: 0.079 · 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
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42305 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2021-42305?
- CVE-2021-42305 is a medium-severity vulnerability in Microsoft Exchange Server. CVSS score: 6.5/10. Published 2021-11-10.
- How severe is CVE-2021-42305?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-42305 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.