What is CVE-2018-20066?

CVE-2018-20066 is a high-severity vulnerability in Google Chrome, classified under Use After Free. CVSS score: 8.8/10. Published 2019-01-09.

How severe is CVE-2018-20066?

High severity. CVSS v3 base score is 8.8 out of 10.

Use After Free in Google Chrome

CVE-2018-20066

Incorrect object lifecycle in Extensions in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

Vulnerability class: Use-After-Free

Published 2019-01-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.8th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Google Chrome — versions unspecified

Weakness classification (CWE)

CWE-416 — Use After Free

References

Frequently asked questions

What is CVE-2018-20066?: CVE-2018-20066 is a high-severity vulnerability in Google Chrome, classified under Use After Free. CVSS score: 8.8/10. Published 2019-01-09.
How severe is CVE-2018-20066?: High severity. CVSS v3 base score is 8.8 out of 10.