⚠ Actively exploited
Added to CISA KEV on 2025-10-02. Federal agencies required to patch by 2025-10-23. Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable..

CVE-2025-21043 — Out-of-bounds Write in Samsung Android

CWE-787 — Out-of-bounds Write7 documents7 sources
Severity
9.8CRITICALNVD
CNA8.8VulnCheck8.8
EPSS
4.9%
top 10.38%
CISA KEV
KEV
Added 2025-10-02
Due 2025-10-23
Exploit
No known exploits
Affected products
1
Samsung Android
Timeline
PublishedSep 12
KEV addedOct 2
KEV dueOct 23
Latest updateNov 7
CISA Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

Out-of-bounds write in libimagecodec.quram.so prior to SMR Sep-2025 Release 1 allows remote attackers to execute arbitrary code.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages1 packages

▶NVDsamsung/android4 versions+3

🔴Vulnerability Details

3
GHSA
GHSA-h4h8-5cww-x7j2: Out-of-bounds write in libimagecodec↗2025-09-12
▶
CVEList
CVE-2025-21043: Out-of-bounds write in libimagecodec↗2025-09-12
▶
VulnCheck
Samsung Mobile Devices Out-of-Bounds Write Vulnerability↗2025
▶

📋Vendor Advisories

1
CISA
Samsung Mobile Devices Out-of-Bounds Write Vulnerability↗2025-10-02
▶

🕵️Threat Intelligence

2
Unit42
LANDFALL: New Commercial-Grade Android Spyware in Exploit Chain Targeting Samsung Devices↗2025-11-07
▶
Bleepingcomputer
Samsung patches actively exploited zero-day reported by WhatsApp↗2025-09-12
▶
CVE-2025-21043 — Out-of-bounds Write in Samsung Android | cvebase