PoC Index

CVE-2021-26858

KEV RANSOMWAREHIGH 7.8EPSS 93.7%

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS v3.1
7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v3.1
7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2.0
6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS
93.65% chance of exploitation in the next 30 days, 100th percentile
CISA KEV
added 2021-11-03, used in ransomware campaigns
Published
2021-03-02
Updated
2026-08-19

Proof-of-concept exploits (3)

References

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