CVE-2018-21065

CRITICALNVD 9.89.8—

9.8

An issue was discovered on Samsung mobile devices with M(6.0), N(7.x), and O(8.x) software. There is an integer underflow in eCryptFS because of a missing size check. The Samsung ID is SVE-2017-11855 (August 2018).

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 34.7%
KEV: Not listed

Published

April 8, 2020

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated May 27, 2026

No patch confirmed yet.

generic

Samsung Mobile Security

https://security.samsungmobile.com/securityUpdate.smsb

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-191Integer Underflow

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 05:24 UTCEG score recompute
2026-05-27 05:24 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-21065?

CVE-2018-21065 is a critical vulnerability published on April 8, 2020. An issue was discovered on Samsung mobile devices with M(6.0), N(7.x), and O(8.x) software. There is an integer underflow in eCryptFS because of a missing size check. The Samsung ID is SVE-2017-11855 (August 2018).

When was CVE-2018-21065 disclosed?

CVE-2018-21065 was first published in the National Vulnerability Database on April 8, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-21065 actively exploited?

CVE-2018-21065 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-21065?

CVE-2018-21065 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2018-21065?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-21065, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-21065

Explore →

Is Your Infrastructure Affected by CVE-2018-21065?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs