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CVE-2025-21043: Samsung Mobile Devices Out-of-Bounds Write Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-10-02
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-12 · updated 2026-10-08
• Weakness: CWE-787

Description

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

Affected products

• Samsung Android: 13.0, 13.0-smr-apr-2022-r1, 13.0-smr-apr-2023-r1, 13.0-smr-apr-2024-r1, 13.0-smr-apr-2025-r1, 13.0-smr-aug-2022-r1 (+99)

References

• https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=09
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21043

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