CVE-2025-23409 Overview
CVE-2025-23409 is a use-after-free vulnerability [CWE-416] affecting OpenHarmony v5.0.2 and prior versions. The flaw allows a local attacker to achieve arbitrary code execution within pre-installed applications on affected devices. Exploitation requires local access with low privileges and does not require user interaction. According to the vendor advisory, the vulnerability can be triggered only in restricted scenarios, which limits its practical exploitability. OpenAtom disclosed the issue through its official security disclosure channel on Gitee.
Critical Impact
A local attacker with low privileges can execute arbitrary code inside pre-installed OpenHarmony applications, compromising confidentiality, integrity, and availability of the affected device.
Affected Products
- OpenAtom OpenHarmony v5.0.2
- OpenAtom OpenHarmony prior versions
- Devices shipping pre-installed OpenHarmony applications
Discovery Timeline
- 2025-03-04 - CVE-2025-23409 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-23409
Vulnerability Analysis
The vulnerability is a use-after-free condition in OpenHarmony, an open-source operating system distributed by the OpenAtom Foundation. Use-after-free flaws occur when a program continues to reference memory after that memory has been released back to the allocator. An attacker who controls the contents of the freed region can hijack execution flow when the dangling pointer is later dereferenced.
In this case, the flaw resides within pre-installed applications shipped with the operating system. A local attacker who can interact with the vulnerable component may trigger the freed-memory reuse to execute arbitrary code inside the target application's process context. The vendor advisory notes that exploitation is possible only in restricted scenarios, indicating specific preconditions must be met.
Root Cause
The root cause is improper memory lifetime management within affected OpenHarmony components. An object is freed while at least one reference to it remains reachable. Subsequent use of that reference operates on memory that may have been reallocated with attacker-controlled contents, leading to arbitrary code execution.
Attack Vector
Exploitation requires local access to the device and low-privilege credentials. No user interaction is required. The attacker must trigger the specific code path where the freed object is referenced and must groom the heap to place controlled data at the freed address. Full technical details are available in the OpenHarmony Security Disclosure.
Detection Methods for CVE-2025-23409
Indicators of Compromise
- Unexpected crashes or SIGSEGV signals in pre-installed OpenHarmony application processes
- Anomalous child processes spawned by pre-installed system applications
- Unauthorized modifications to files or configurations owned by pre-installed applications
Detection Strategies
- Monitor application process behavior for deviations from baseline, including unexpected system call sequences or memory access patterns
- Collect and inspect device crash logs for repeated faults in the same pre-installed component, which may indicate exploitation attempts
- Track privilege transitions and code execution originating from pre-installed applications that historically do not spawn subprocesses
Monitoring Recommendations
- Centralize OpenHarmony device logs into a security data lake for correlation across the fleet
- Alert on repeated abnormal terminations of the same pre-installed application within short time windows
- Review installed application inventories and verify that vulnerable OpenHarmony versions are tracked in asset management
How to Mitigate CVE-2025-23409
Immediate Actions Required
- Identify all devices running OpenHarmony v5.0.2 or earlier and prioritize them for remediation
- Apply the security update referenced in the OpenHarmony security disclosure as soon as it is available for the affected device model
- Restrict local access to affected devices and enforce strong authentication for low-privilege accounts
Patch Information
OpenAtom has published details of the fix through the OpenHarmony Security Disclosure. Device vendors that ship OpenHarmony-based firmware should integrate the upstream patch and deliver it through their standard update channels. Verify device firmware versions after update to confirm remediation.
Workarounds
- Limit installation and use of untrusted local applications that could interact with the vulnerable pre-installed component
- Enforce least-privilege policies to reduce the population of local accounts capable of triggering the flaw
- Where feasible, disable or restrict the affected pre-installed application until the patched firmware is deployed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
