What is CVE-2021-1705?

CVE-2021-1705 is a medium-severity vulnerability in Microsoft Edge. CVSS score: 4.2/10. Published 2021-01-12.

How severe is CVE-2021-1705?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Microsoft Edge

CVE-2021-1705

Microsoft Edge (HTML-based) Memory Corruption Vulnerability

Published 2021-01-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.021 (81.3th percentile), scored 2026-10-28.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.021 · change: +0.002

Affected products

Microsoft Edge
Microsoft Edge (Edgehtml-Based) — versions 1.0..0
Microsoft Windows 10 — versions 20h2, 1607, 1803
Microsoft Windows Server 2016
Microsoft Windows Server 2019

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1705 (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2021-1705?: CVE-2021-1705 is a medium-severity vulnerability in Microsoft Edge. CVSS score: 4.2/10. Published 2021-01-12.
How severe is CVE-2021-1705?: Medium severity. CVSS v3 base score is 4.2 out of 10.