What is CVE-2020-17063?

CVE-2020-17063 is a medium-severity vulnerability in Microsoft 365 Apps. CVSS score: 6.8/10. Published 2020-11-11.

How severe is CVE-2020-17063?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Microsoft 365 Apps

CVE-2020-17063

Microsoft Office Online Spoofing Vulnerability

Published 2020-11-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.6th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Microsoft 365 Apps
Microsoft 365 Apps For Enterprise — versions 16.0.1
Microsoft Office 2019 — versions 19.0.0
Microsoft Office — versions 2019

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17063 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-17063?: CVE-2020-17063 is a medium-severity vulnerability in Microsoft 365 Apps. CVSS score: 6.8/10. Published 2020-11-11.
How severe is CVE-2020-17063?: Medium severity. CVSS v3 base score is 6.8 out of 10.