What is CVE-2020-6564?

CVE-2020-6564 is a medium-severity vulnerability in Google Chrome, classified under Improper Preservation of Permissions. CVSS score: 6.5/10. Published 2020-09-21.

How severe is CVE-2020-6564?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2020-6564 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Google Chrome

CVE-2020-6564

Inappropriate implementation in permissions in Google Chrome prior to 85.0.4183.83 allowed a remote attacker to spoof the contents of a permission dialog via a crafted HTML page.

Published 2020-09-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.015 (74.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Google Chrome — versions unspecified
Debian Linux — versions 10.0
Fedoraproject Fedora — versions 33
openSUSE Backports Sle — versions 15.0
openSUSE Leap — versions 15.1, 15.2

Weakness classification (CWE)

CWE-281 — Improper Preservation of Permissions

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2020-6564

References

chromereleases.googleblog.com/2020/08/stable-channel-update-for-desktop_25.html (Vendor Advisory)
crbug.com/841622 (Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-09/msg00072.html (vendor-advisory, Mailing List, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-09/msg00078.html (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-09/msg00081.html (vendor-advisory, Third Party Advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
www.debian.org/security/2021/dsa-4824 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2020-6564?: CVE-2020-6564 is a medium-severity vulnerability in Google Chrome, classified under Improper Preservation of Permissions. CVSS score: 6.5/10. Published 2020-09-21.
How severe is CVE-2020-6564?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2020-6564 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.