Vulnerability in Microsoft Exchange Server
CVE-2021-34470
Microsoft Exchange Server Elevation of Privilege Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.044 (91.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · 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 2019 Cumulative Update 10 — versions 15.02.0
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory, VDB Entry)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34470 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2021-34470?
- CVE-2021-34470 is a high-severity vulnerability in Microsoft Exchange Server. CVSS score: 8.0/10. Published 2021-07-14.
- How severe is CVE-2021-34470?
- High severity. CVSS v3 base score is 8.0 out of 10.
- Is CVE-2021-34470 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.