CVE-2025-21034

Local code execution via improper input validation

Published Sep 3, 2025 · Updated Sep 3, 2025

Out-of-bounds write in libsavsvc.so on Samsung Mobile Devices before SMR Sep-2025 Release 1 allows local users to execute code. The library writes beyond a buffer because it fails to validate input, but Samsung has not disclosed the affected parser, field, or bounds operation. Local access to a device running an affected Android 13, 14, 15, or 16 release is required; successful exploitation alters memory and executes code.

CVSS severity4.0
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in libsavsvc.so on Samsung Mobile Devices before SMR Sep-2025 Release 1 allows local users to execute code. The library writes beyond a buffer because it fails to validate input, but Samsung has not disclosed the affected parser, field, or bounds operation. Local access to a device running an affected Android 13, 14, 15, or 16 release is required; successful exploitation alters memory and executes code.

The record

CVE
CVE-2025-21034
Published
Sep 3, 2025
Updated
Sep 3, 2025
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-787, T1658
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile DevicesAffected versions are unavailable in this record.

Published CVSS scores

4.0Samsung MobileCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1658Exploitation for Client Execution

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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