Vulnerability in Microsoft Exchange Server 2016 Cumulative Update 21
CVE-2021-34453
Microsoft Exchange Server Denial of Service Vulnerability
EPSS: 0.084 (92.5th percentile) — read the EPSS interpretation.
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/E:U/RL:O/RC:C.
Affected products
- 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 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-34453?
- CVE-2021-34453 is a high-severity vulnerability in Microsoft Exchange Server 2016 Cumulative Update 21. 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.