CVE-2020-17144
KEVMicrosoft Exchange Server Remote Code Execution Vulnerability
Description
Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.
Microsoft Exchange Remote Code Execution Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:HPublishedDec 10, 2020
Last modifiedJun 17, 2026
Added to KEVNov 3, 2021
Remediation dueMay 3, 2022
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17144PatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17144US Government Resource
0 recent articles mention this CVE
76
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1637 days
- CVSS
- 8.4 HIGH
- EPSS (30-day exploit probability)
- 36.5% · top 2% of all CVEs
- Weakness
- CWE-502
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.