CVE-2021-25415

Hypervisor memory write via improper address validation

Published Jun 11, 2021 · Updated Aug 3, 2024

Improper address validation in RKP on Samsung Mobile Devices before SMR JUN-2021 Release 1 allows local users to make EL2 memory writable. RKP accepts an EL1-originated memory-attribution change without properly excluding protected EL2 addresses. Exploitation requires prior EL1 compromise on Android 10 or 11 devices using specified Exynos chipsets and permits writes to protected hypervisor memory.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper address validation in RKP on Samsung Mobile Devices before SMR JUN-2021 Release 1 allows local users to make EL2 memory writable. RKP accepts an EL1-originated memory-attribution change without properly excluding protected EL2 addresses. Exploitation requires prior EL1 compromise on Android 10 or 11 devices using specified Exynos chipsets and permits writes to protected hypervisor memory.

The record

CVE
CVE-2021-25415
Published
Jun 11, 2021
Updated
Aug 3, 2024
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-20, CWE-94, T1404
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Q(10.0), R(11.0) devices with Exynos9610, 9810, 9820, 9830 <SMA JUN-2021 Release 1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile Devicesversion=Q(10.0), R(11.0) devices with Exynos9610, 9810, 9820, 9830 <SMA JUN-2021 Release 1

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-94Improper Control of Generation of Code ('Code Injection')
T1404Exploitation for Privilege Escalation

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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