What is CVE-2021-21117?

CVE-2021-21117 is a high-severity vulnerability in Google Chrome, classified under Improper Link Resolution Before File Access. CVSS score: 7.8/10. Published 2021-02-09.

How severe is CVE-2021-21117?

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

Vulnerability in Google Chrome

CVE-2021-21117

Insufficient policy enforcement in Cryptohome in Google Chrome prior to 88.0.4324.96 allowed a local attacker to perform OS-level privilege escalation via a crafted file.

Published 2021-02-09 · 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: 0.002 (11.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Google Chrome — versions unspecified

Weakness classification (CWE)

References

chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html (Release Notes, Vendor Advisory)
crbug.com/1137179 (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21117?: CVE-2021-21117 is a high-severity vulnerability in Google Chrome, classified under Improper Link Resolution Before File Access. CVSS score: 7.8/10. Published 2021-02-09.
How severe is CVE-2021-21117?: High severity. CVSS v3 base score is 7.8 out of 10.