What is CVE-2020-17066?

CVE-2020-17066 is a high-severity vulnerability in Microsoft Excel. CVSS score: 7.8/10. Published 2020-11-11.

How severe is CVE-2020-17066?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Microsoft Excel

CVE-2020-17066

Microsoft Excel Remote Code Execution Vulnerability

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

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.041 (90.5th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.041 · newest: 0.041 · change: 0.000

Affected products

Microsoft Excel — versions 2010
Microsoft Excel 2010 Service Pack 2 — versions 13.0.0.0

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17066 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-17066?: CVE-2020-17066 is a high-severity vulnerability in Microsoft Excel. CVSS score: 7.8/10. Published 2020-11-11.
How severe is CVE-2020-17066?: High severity. CVSS v3 base score is 7.8 out of 10.