What is CVE-2018-0518?

CVE-2018-0518 is a medium-severity vulnerability in Linecorp Line, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2018-02-23.

How severe is CVE-2018-0518?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Linecorp Line

CVE-2018-0518

LINE for iOS version 7.1.3 to 7.1.5 does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Vulnerability class: Improper Certificate Validation

Published 2018-02-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.2% 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

Linecorp Line
Line Corporation For iOS — versions version 7.1.3 to 7.1.5

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

linecorp.com/en/security/article/136 (Vendor Advisory)
jvn.jp/en/jp/JVN75453852/index.html (VDB Entry, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2018-0518?: CVE-2018-0518 is a medium-severity vulnerability in Linecorp Line, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2018-02-23.
How severe is CVE-2018-0518?: Medium severity. CVSS v3 base score is 5.9 out of 10.