Microsoft · Security update · April 13, 2021
KB5001779: April 2021 security update
KB5001779, released April 13, 2021, fixes 7 CVEs across 5 products. 3 of them are being exploited (CVE-2021-34473); 3 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.
Patch now3 on CISA KEVKnown ransomware use2 publicly disclosedUnsupported product
CVEs closed
7
5 rated Critical
Exploited
3
CVE-2021-34473
Exploitation more likely
4
Microsoft's assessment
Highest EPSS
1.0000
99th percentile
Priority of the 7 CVEs
Patch now 3
Urgent 4
High 0
Routine 0
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2021-34473 | Microsoft Exchange Server | Remote Code Execution | 9.1 | 1.0000 | KEVRansomwareDisclosedExploited |
| Patch now | CVE-2021-34523 | Microsoft Exchange Server | Elevation of Privilege | 9.0 | 0.9999 | KEVRansomwareDisclosedExploited |
| Patch now | CVE-2021-33766 | Microsoft Exchange Server | Information Disclosure | 7.3 | 0.9818 | KEVExploited |
| Urgent | CVE-2021-28482 | Microsoft Exchange Server | Remote Code Execution | 8.8 | 0.8321 | More likely |
| Urgent | CVE-2021-28480 | Microsoft Exchange Server | Remote Code Execution | 9.8 | 0.7123 | More likely |
| Urgent | CVE-2021-28481 | Microsoft Exchange Server | Remote Code Execution | 9.8 | 0.3624 | More likely |
| Urgent | CVE-2021-28483 | Microsoft Exchange Server | Remote Code Execution | 9.0 | 0.0120 | More likely |
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