What is CVE-2025-14021?

CVE-2025-14021 is a medium-severity vulnerability in Linecorp Line, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.3/10. Published 2025-12-15.

How severe is CVE-2025-14021?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Linecorp Line

CVE-2025-14021

The in-app browser in LINE client for iOS versions prior to 14.14 is vulnerable to address bar spoofing, which could allow attackers to execute malicious JavaScript within iframes while displaying trusted URLs, enabling phishing attacks through overlaid malicious content.

Published 2025-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (10.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.3% 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

Linecorp Line
Line Corporation Client For iOS — versions 14.13

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

hackerone.com/reports/2548498 (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2025-14021?: CVE-2025-14021 is a medium-severity vulnerability in Linecorp Line, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.3/10. Published 2025-12-15.
How severe is CVE-2025-14021?: Medium severity. CVSS v3 base score is 4.3 out of 10.