CVE-2025-21070

Memory corruption via unvalidated SPI decoding

Published Oct 10, 2025 · Updated Oct 10, 2025

Out-of-bounds write in the SPI decoder in Samsung Notes before 4.4.30.63 allows local users to corrupt memory while decoding SPI data. The decoder fails to validate SPI input before writing decoded data beyond its intended memory boundary. The flaw is locally reachable without privileges or user interaction, and the published impact is limited to memory integrity.

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

Out-of-bounds write in the SPI decoder in Samsung Notes before 4.4.30.63 allows local users to corrupt memory while decoding SPI data. The decoder fails to validate SPI input before writing decoded data beyond its intended memory boundary. The flaw is locally reachable without privileges or user interaction, and the published impact is limited to memory integrity.

The record

CVE
CVE-2025-21070
Published
Oct 10, 2025
Updated
Oct 10, 2025
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Notes
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2025Record 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 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 NotesAffected versions are unavailable in this record.

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0Samsung MobileCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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