Microsoft · Security update · May 11, 2021
KB5003435: May 2021 security update
KB5003435, released May 11, 2021, fixes 4 CVEs across 5 products. One of them is being exploited (CVE-2021-31207); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.
Patch now1 on CISA KEVKnown ransomware use1 publicly disclosedUnsupported product
CVEs closed
4
None rated Critical
Exploited
1
CVE-2021-31207
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.9978
99th percentile
Priority of the 4 CVEs
Patch now 1
Urgent 0
High 1
Routine 2
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2021-31207 | Microsoft Exchange Server | Security Feature Bypass | 6.6 | 0.9978 | KEVRansomwareDisclosedExploited |
| High | CVE-2021-31198 | Microsoft Exchange Server | Remote Code Execution | 7.8 | 0.0487 | Exploitation Less Likely |
| Routine | CVE-2021-31195 | Microsoft Exchange Server | Remote Code Execution | 6.5 | 0.7368 | Exploitation Less Likely |
| Routine | CVE-2021-31209 | Microsoft Exchange Server | Spoofing | 6.5 | 0.0263 | Exploitation Less Likely |
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