CVE-2025-21043

HIGH8.8

CISA KEV

Published 2025-09-12 · Updated 2026-10-08 · Source mobile.security@samsung.com

Summary

CVE-2025-21043 is a high-severity (CVSS 8.8) vulnerability in Samsung Mobile Devices. CISA added it to the Known Exploited Vulnerabilities catalog on October 2, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 23, 2025. CISA does not currently list it as used in ransomware campaigns. Samsung has 15 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 15 known-exploited Samsung vulnerabilities →

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:R/S:U/C:H/I:H/A:H

CWE-787CWE-787

CISA Known-Exploited Vulnerability

Product: Samsung — Mobile Devices

Name: Samsung Mobile Devices Out-of-Bounds Write Vulnerability

Date added: 2025-10-02 · Due: 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.

References

View on NVD

More exploited Samsung vulnerabilities

Most recently added to CISA KEV

CVE-2024-7399
MagicINFO 9 Server — Samsung MagicINFO 9 Server Path Traversal Vulnerability
added 2026-04-24
CVE-2025-21042
Mobile Devices — Samsung Mobile Devices Out-of-Bounds Write Vulnerability
added 2025-11-10
CVE-2025-4632
MagicINFO 9 Server — Samsung MagicINFO 9 Server Path Traversal Vulnerability
added 2025-05-22
CVE-2022-22265
Mobile Devices — Samsung Mobile Devices Use-After-Free Vulnerability
added 2023-09-18
CVE-2021-25487
Mobile Devices — Samsung Mobile Devices Out-of-Bounds Read Vulnerability
added 2023-06-29
CVE-2021-25489
Mobile Devices — Samsung Mobile Devices Improper Input Validation Vulnerability
added 2023-06-29

View all →

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