CVE-2018-21066Network attack vector

Memory corruption via unchecked Trustlet buffer sizes

Published Apr 8, 2020 · Updated Aug 5, 2024

A buffer overflow in a Trustlet on Samsung mobile devices running Android 6.0 allows attackers to corrupt memory via unspecified vectors. The Trustlet fails to verify source and destination sizes before copying data into a buffer, allowing the copy to exceed its boundary. Public records do not identify the entry point or required privileges, and Samsung's bulletin instead lists Android 7.x, leaving exposure boundaries inconsistent.

CVSS severity9.8
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in a Trustlet on Samsung mobile devices running Android 6.0 allows attackers to corrupt memory via unspecified vectors. The Trustlet fails to verify source and destination sizes before copying data into a buffer, allowing the copy to exceed its boundary. Public records do not identify the entry point or required privileges, and Samsung's bulletin instead lists Android 7.x, leaving exposure boundaries inconsistent.

The record

CVE
CVE-2018-21066
Published
Apr 8, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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