CVE-2020-17144
HIGH · CVSS 8.4CISA KEV: actively exploitedEPSS 36.5%EU EUVD: exploited
Microsoft Exchange Remote Code Execution Vulnerability
Key facts
- CVSS score
- 8.4 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H- Weakness (CWE)
- CWE-502
- EPSS score
- 36.5% (98th percentile)
- In CISA KEV
- Yes, added November 3, 2021
- In EU EUVD
- Yes (EUVD-2020-9098)
- Published
- December 10, 2020
- NVD last modified
- June 17, 2026
- Status
- Analyzed
CISA Known Exploited Vulnerability
Microsoft Exchange Server Remote Code Execution Vulnerability
Added to the KEV catalog on November 3, 2021; federal remediation due May 3, 2022.
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2020-9098 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on June 9, 2026.
View on the EU Vulnerability DatabaseAffected products
- microsoft / exchange server
Certified products that may be affected
1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.
- Microsoft Exchange Server 2010 SP1 Enterprise (English) 64-bit - Microsoft Corporation - Common Criteria Certificate Number: 2011/72 - archived
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144(Patch, Vendor Advisory)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17144(Patch, Vendor Advisory)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17144(US Government Resource)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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