Microsoft · Security update · May 11, 2021
KB5003729: May 2021 security update
KB5003729, released May 11, 2021, fixes 2 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.
HighUnsupported product
CVEs closed
2
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0222
82nd percentile
Priority of the 2 CVEs
Patch now 0
Urgent 0
High 1
Routine 1
Applies to
| Product |
|---|
| Microsoft Lync Server 2013 CU10 |
| Skype for Business Server 2015 CU11 |
| Skype for Business Server 2019 CU5 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2021-26422 | Skype for Business and Microsoft Lync | Remote Code Execution | 7.2 | 0.0222 | Exploitation Less Likely |
| Routine | CVE-2021-26421 | Skype for Business and Microsoft Lync | Spoofing | 6.5 | 0.0141 | Exploitation Less Likely |
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