CVE-2021-42321
KEV RANSOMWAREHIGH 8.8EPSS 91.7%
Microsoft Exchange Server Remote Code Execution Vulnerability
- CVSS v3.1
- 8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1
- 8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v2.0
- 6.5 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:P - EPSS
- 91.74% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2021-11-17, used in ransomware campaigns
- Published
- 2021-11-10
- Updated
- 2026-08-19
Proof-of-concept exploits (6)
- http://packetstormsecurity.com/files/166153/Microsoft-Exchange-Server-Remote-Code-Executi…
- http://packetstormsecurity.com/files/168131/Microsoft-Exchange-Server-ChainedSerializatio…
- 7BitsTeam/exch_CVE-2021-4232110★ · 2022-10-08
- DarkSprings/CVE-2021-4232183★ · 2021-11-23
- timb-machine-mirrors/CVE-2021-42321_poc0★ · 2022-01-05
- timb-machine-mirrors/testanull-CVE-2021-42321_poc.py0★ · 2022-01-05