Microsoft Exchange Remote Code Execution Vulnerability
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Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.4 retained for reference. Confidence: HIGH.
Microsoft Exchange Remote Code Execution Vulnerability
December 10, 2020
October 29, 2025
Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-17144Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17144Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17144MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Exchange2010 authorized RCE
Open source ↗weaponized tool for CVE-2020-17144
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msrc
CWE-94