What is CVE-2018-21058?

CVE-2018-21058 is a critical-severity vulnerability in Google Android, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 9.8/10. Published 2020-04-08.

How severe is CVE-2018-21058?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Google Android

CVE-2018-21058

An issue was discovered on Samsung mobile devices with N(7.0), O(8.0) (exynos7420 or Exynos 8890/8996 chipsets) software. Cache attacks can occur against the Keymaster AES-GCM implementation because T-Tables are used; the Cryptography Extension (CE) is not used. The Samsung ID is SVE-2018-12761 (September 2018).

Vulnerability class: POODLE (CVE-2014-3566)

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (17.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.9% 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

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

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

Frequently asked questions

What is CVE-2018-21058?: CVE-2018-21058 is a critical-severity vulnerability in Google Android, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 9.8/10. Published 2020-04-08.
How severe is CVE-2018-21058?: Critical severity. CVSS v3 base score is 9.8 out of 10.