What is CVE-2023-21795?

CVE-2023-21795 is a high-severity vulnerability in Microsoft Edge Chromium, classified under Use After Free. CVSS score: 8.3/10. Published 2023-01-24.

How severe is CVE-2023-21795?

High severity. CVSS v3 base score is 8.3 out of 10.

Use After Free in Microsoft Edge Chromium

CVE-2023-21795

Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

Vulnerability class: Use-After-Free

Published 2023-01-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Microsoft Edge Chromium
Microsoft Edge (Chromium-Based) — versions 1.0.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21795 (vendor-advisory)

Frequently asked questions

What is CVE-2023-21795?: CVE-2023-21795 is a high-severity vulnerability in Microsoft Edge Chromium, classified under Use After Free. CVSS score: 8.3/10. Published 2023-01-24.
How severe is CVE-2023-21795?: High severity. CVSS v3 base score is 8.3 out of 10.