KEV · Actively exploited
CVE-2021-26855
CRITICAL 9.1
KEV
Microsoft Exchange Server Remote Code Execution Vulnerability
EPSS
94.31%
exploit likely
percentile 100.0%
CISA Known Exploited Vulnerability
- Added to KEV
- 2021-11-03
- Remediation deadline
- 2022-05-03
- Required action
- Apply updates per vendor instructions.
- Ransomware
- Yes, known ransomware campaign