What is CVE-2021-36214?

CVE-2021-36214 is a medium-severity vulnerability in Linecorp Line, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-13.

How severe is CVE-2021-36214?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Linecorp Line

CVE-2021-36214

LINE client for iOS before 10.16.3 allows cross site script with specific header in WebView.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Linecorp Line
Line Corporation Client For iOS — versions <

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

hackerone.com/reports/988332 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-36214?: CVE-2021-36214 is a medium-severity vulnerability in Linecorp Line, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-13.
How severe is CVE-2021-36214?: Medium severity. CVSS v3 base score is 6.1 out of 10.