CVE-2025-21043
Samsung Mobile Devices Out-of-Bounds Write Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 23 October 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Out-of-bounds write in libimagecodec.quram.so prior to SMR Sep-2025 Release 1 allows remote attackers to execute arbitrary code.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.22% probability · 83th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 2 October 2025 · due 23 October 2025
- Weakness
- CWE-787
- Affected
- samsung/android
- Source
- mobile.security@samsung.com
EPSS 2.2% since 30 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=09 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21043
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.