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7.8HIGHCISA KEV — actively exploited

CVE-2021-26858 — Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft · Exchange Server · Published 3 Mar 2021 · Modified 1 Oct 2026

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

References

What to do
  1. Check whether Exchange Server is in your asset inventory.
  2. Exploitation confirmed — patch within 72 hours.
  3. Record the decision in your risk register for audit evidence.
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Link: adminadda.com/cve/CVE-2021-26858