CVE-2021-25496

Local code execution via maetd_dec_slice overflow

Published Oct 6, 2021 · Updated Aug 3, 2024

Buffer overflow in Samsung Notes before 4.3.02.61 allows local users to execute arbitrary code through the libSPenBase library. The maetd_dec_slice routine copies attacker-controlled input without verifying that it fits the destination buffer, writing beyond its bounds. Local reachability requires no prior privileges or user interaction; successful exploitation runs code in the application's security context.

CVSS severity7.3
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Samsung Notes before 4.3.02.61 allows local users to execute arbitrary code through the libSPenBase library. The maetd_dec_slice routine copies attacker-controlled input without verifying that it fits the destination buffer, writing beyond its bounds. Local reachability requires no prior privileges or user interaction; successful exploitation runs code in the application's security context.

The record

CVE
CVE-2021-25496
Published
Oct 6, 2021
Updated
Aug 3, 2024
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Notes
Classifications
CWE-120, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 6, 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=- <4.3.02.61

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Samsung Electronics Co., Ltd. · Samsung Notesversion=- <4.3.02.61

Published CVSS scores

4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3Samsung MobileCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/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.

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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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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