What is CVE-2018-21078?

CVE-2018-21078 is a high-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-04-08.

How severe is CVE-2018-21078?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Google Android

CVE-2018-21078

An issue was discovered on Samsung mobile devices with M(6.0), N(7.x), and O(8.0) software. The Contacts application allows attackers to originate video calls because SS (Supplementary Service) and USSD (Unstructured Supplementary Service Data) codes are improperly secured. The Samsung ID is SVE-2018-11469 (April 2018).

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-04-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Google Android — versions 6.0, 7.0, 7.1.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2018-21078?: CVE-2018-21078 is a high-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-04-08.
How severe is CVE-2018-21078?: High severity. CVSS v3 base score is 7.5 out of 10.