CVE-2021-26857
Act now ● On CISA KEV — actively exploited used in ransomware
Actively exploited — on the CISA KEV list.
CVSS base
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
95.8%
99.9th percentile
CISA KEV
Listed
Added 2021-11-03 · patch by 2022-05-03
Weakness / dates
CWE-502
Published 2021-03-03 · modified 2026-08-19
Description
Microsoft Exchange Server Remote Code Execution Vulnerability