Is CVE-2018-21058 actively exploited?

No active exploitation of CVE-2018-21058 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-21058 be exploited remotely?

Yes. CVE-2018-21058 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-21058?

CVE-2018-21058 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2018-21058

CWE-327Published: April 8, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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).

NVD Source

Technical Analysis

CVE-2018-21058 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.