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

Historical catalog analysis: CISA added this entry on October 02, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2025-21043 is an out-of-bounds write vulnerability (CWE-787) identified in Samsung mobile devices. The flaw resides specifically within the libimagecodec.quram.so component. If exploited, this vulnerability could allow a remote attacker to execute arbitrary code on the affected device.

Exposure and applicability

This vulnerability applies to Samsung mobile devices utilizing the affected image codec library. Organizations managing corporate mobile fleets or providing managed mobile endpoints should identify assets running the vulnerable libimagecodec.quram.so component. Because the flaw allows for remote execution, exposure is primarily linked to the device’s processing of specially crafted data that triggers the out-of-bounds write.

Remediation priorities

Based on our analysis, vulnerability management teams should prioritize remediation based on the following hierarchy:

1. Vendor Patch Application: The primary corrective action is to apply mitigations and updates as specified in Samsung’s official vendor instructions.
2. Asset Identification: Infrastructure owners must audit mobile device inventories to determine which hardware models and software versions are utilizing the vulnerable library.
3. Service Decommissioning: In scenarios where a vendor mitigation is unavailable or cannot be applied to legacy hardware, the source suggests discontinuing use of the product to eliminate the exposure path.

How to validate remediation

To ensure that exposure has been reduced, defenders should move beyond simple version checks. We recommend the following validation approach:

• Verification of Patch Deployment: Confirm through mobile device management (MDM) tools or system logs that the specific vendor update addressing CVE-2025-21043 has been successfully installed and initialized.
• Component Analysis: Where possible, verify that the libimagecodec.quram.so library has been updated to a version where the out-of-bounds write condition is resolved.

It is important to note that a successful update installation does not guarantee total immunity but indicates that the known vulnerability path has been addressed.

Limits and open questions

There are several unknowns regarding this vulnerability. The source does not specify whether this flaw has been leveraged in active ransomware campaigns, listing its status as “Unknown.” Additionally, while the entry path is identified as remote, the specific delivery mechanism (e.g., a malicious file or network packet) is not detailed in the provided data. Residual risk remains for devices that cannot be updated due to end-of-life status or those where updates are delayed by carrier rollout schedules.

Source and editorial note

CVE-2025-21043: Samsung Mobile Devices Out-of-Bounds Write Vulnerability · Source date: October 02, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: October 05, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 01, 2026 at 00:46 UTC.

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