CVE-2021-25459

Temporary service interruption via unchecked sspInit RPC

Published Sep 9, 2021 · Updated Aug 3, 2024

Improper authorization in Samsung Mobile Devices before SMR Sep-2021 Release 1 allows local users to interrupt /dev/ssp access. The sspInit RPC in BlockchainTZService omits a privilege check, allowing any app to start the service and temporarily deny access to the /dev/ssp device node. A locally installed app can trigger the interruption without user interaction or elevated privileges; no data access or persistent device disruption is reported.

CVSS severity4.0
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Samsung Mobile Devices before SMR Sep-2021 Release 1 allows local users to interrupt /dev/ssp access. The sspInit RPC in BlockchainTZService omits a privilege check, allowing any app to start the service and temporarily deny access to the /dev/ssp device node. A locally installed app can trigger the interruption without user interaction or elevated privileges; no data access or persistent device disruption is reported.

The record

CVE
CVE-2021-25459
Published
Sep 9, 2021
Updated
Aug 3, 2024
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-285, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 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=Select Q(10.0), R(11.0) devices <SMR Sep-2021 Release 1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile Devicesversion=Select Q(10.0), R(11.0) devices <SMR Sep-2021 Release 1

Published CVSS scores

4.0Samsung MobileCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1499Endpoint Denial of Service

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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