Microsoft · Security update · November 9, 2021
KB5007409: November 2021 security update
KB5007409, released November 9, 2021, fixes 3 CVEs across 5 products. One of them is being exploited (CVE-2021-42321); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.
Patch now1 on CISA KEVKnown ransomware useUnsupported product
CVEs closed
3
None rated Critical
Exploited
1
CVE-2021-42321
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.9350
99th percentile
Priority of the 3 CVEs
Patch now 1
Urgent 0
High 0
Routine 2
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2021-42321 | Microsoft Exchange Server | Remote Code Execution | 8.8 | 0.9174 | KEVRansomwareExploited |
| Routine | CVE-2021-41349 | Microsoft Exchange Server | Spoofing | 6.5 | 0.9350 | Exploitation Less Likely |
| Routine | CVE-2021-42305 | Microsoft Exchange Server | Spoofing | 6.5 | 0.0787 | Exploitation Less Likely |
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