Vulnerability in Microsoft Exchange Server
CVE-2021-34453
Microsoft Exchange Server Denial of Service Vulnerability
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000
Affected products
- Microsoft Exchange Server — versions 2016, 2019
- 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
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34453 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-34453?
- CVE-2021-34453 is a high-severity vulnerability in Microsoft Exchange Server. CVSS score: 7.5/10. Published 2021-10-13.
- How severe is CVE-2021-34453?
- High severity. CVSS v3 base score is 7.5 out of 10.