Vulnerability · Published Oct 13, 2021 · Assigned by microsoft
CVE-2021-34453Microsoft Exchange Server Denial of Service Vulnerability
High 7.5
In plain English
A high-severity security flaw in Microsoft Exchange Server 2016 Cumulative Update 21 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.8% (higher than 87% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)2.8%top 13.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Microsoft Exchange Server Denial of Service Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 11 | 15.02.0 – before 15.02.0986.009 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 10 | 15.02.0 – before 15.02.0922.014 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 21 | 15.01.0 – before 15.01.2308.015 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 22 | 15.0.0 – before 15.01.2375.012 |