CVE Alert: CVE-2025-21043 – Samsung Mobile – Samsung Mobile Devices
CVE-2025-21043
Out-of-bounds write in libimagecodec.quram.so prior to SMR Sep-2025 Release 1 allows remote attackers to execute arbitrary code.
AI Summary Analysis
Risk verdict
High risk with immediate priority due to active exploitation and KEV listing; treat as priority 1.
Why this matters
Allows remote code execution on Samsung mobile devices through a media decoding library, with full impact on confidentiality, integrity and availability. In practice, an attacker could entice a user to view or process malformed media, enabling compromise without local access privileges.
Most likely attack path
Network-based delivery of a crafted media payload triggers a memory corruption in the image codec library. No privileges are required, but user interaction is needed; there is low attack complexity. If successful, attacker gains code execution within the app’s or OS’s user context, with potential lateral movement limited by the initial scope but high impact.
Who is most exposed
Consumers and organisations with Samsung Android devices are at risk, especially fleets deploying stock or customised Samsung mobile devices without timely patching.
Detection ideas
- Look for crashes or anomalous dumps in the media decoding process (libimagecodec.quram.so).
- Monitor for unusual network traffic patterns involving image/media payloads or decoders.
- Alert on failed or unexpected media processing events following user actions.
- Correlate with CVE-2025-21043 exploitation indicators in security logs and incident tickets.
Mitigation and prioritisation
- Apply the SMR Sep-2025 Release patch across affected devices as a top update priority.
- Enforce rapid update deployment via MDM/ENM to reduce exposure window; disable or restrict vulnerable media decoding where feasible.
- Implement compensating controls: restrict inbound media sources to trusted apps, enable strict app permission modelling, and enhance monitoring for decode-related anomalies.
- Change-management: include this in the urgent patching window; verify patch rollout and perform post-deployment validation.
- Because KEV is active and exploitation is known, treat as priority 1.
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