CVE-2018-21052Network attack vector

Arbitrary code execution via unvalidated shared memory

Published Apr 8, 2020 · Updated Aug 5, 2024

Arbitrary code execution in Samsung Exynos mobile devices running Android 7.x or 8.x allows attackers to compromise the VaultKeeper Trustlet. The Trustlet accepts a shared-memory address without proper validation, exposing that address and enabling its use for arbitrary code execution. Public records do not identify the entry point or required access, so the practical attack gate and privileges gained outside the Trustlet remain undisclosed.

CVSS severity9.8
Critical
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary code execution in Samsung Exynos mobile devices running Android 7.x or 8.x allows attackers to compromise the VaultKeeper Trustlet. The Trustlet accepts a shared-memory address without proper validation, exposing that address and enabling its use for arbitrary code execution. Public records do not identify the entry point or required access, so the practical attack gate and privileges gained outside the Trustlet remain undisclosed.

The record

CVE
CVE-2018-21052
Published
Apr 8, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119
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

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

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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