CVE-2025-27132 Overview
CVE-2025-27132 is an out-of-bounds write vulnerability [CWE-787] affecting OpenHarmony v5.0.3 and prior versions. A local attacker with low privileges can exploit the flaw to execute arbitrary code within pre-installed applications on affected devices. The issue is constrained to restricted exploitation scenarios but retains full impact on confidentiality, integrity, and availability once triggered.
OpenAtom disclosed the vulnerability through the OpenHarmony security disclosure repository. Devices running the affected OpenHarmony builds should apply vendor updates promptly, as arbitrary code execution in pre-installed apps can enable persistent footholds and further privilege escalation.
Critical Impact
A local, authenticated attacker can achieve arbitrary code execution inside pre-installed OpenHarmony applications by triggering an out-of-bounds memory write.
Affected Products
- OpenAtom OpenHarmony v5.0.3
- OpenAtom OpenHarmony prior versions
- Devices and pre-installed applications built on affected OpenHarmony releases
Discovery Timeline
- 2025-05-06 - CVE-2025-27132 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-27132
Vulnerability Analysis
The vulnerability is an out-of-bounds write [CWE-787] in OpenHarmony components used by pre-installed applications. When affected code paths process attacker-influenced input, they write data past the intended buffer boundary. This corrupts adjacent memory structures and can be leveraged to hijack control flow within the target application.
Exploitation requires local access and low-privilege execution on the device. No user interaction is required, and the attack executes without crossing a trust boundary outside the local scope. Successful exploitation grants the attacker the privileges of the pre-installed application, which on OpenHarmony devices may include access to sensitive APIs and system services.
Root Cause
The root cause is missing or insufficient bounds validation before a memory write operation. The affected component accepts attacker-controlled input that determines either the write offset or the length of data copied into a fixed-size buffer. Without adequate boundary checks, the write extends beyond the allocated region.
Attack Vector
The attack vector is local. An attacker must already run code on the device with at least low privileges, such as through an installed malicious application or a compromised low-privileged process. The attacker then delivers a crafted payload to a vulnerable pre-installed application component, triggering the out-of-bounds write and pivoting to arbitrary code execution inside that app.
A verified proof-of-concept is not publicly available. Technical details are documented in the OpenHarmony Security Disclosure.
Detection Methods for CVE-2025-27132
Indicators of Compromise
- Unexpected crashes or restarts of pre-installed OpenHarmony applications, which may indicate failed exploitation attempts against the vulnerable component.
- Anomalous child processes or code loading events originating from pre-installed apps that normally do not spawn additional processes.
- Unusual file writes or IPC activity from low-privileged local applications targeting pre-installed app interfaces.
Detection Strategies
- Monitor OpenHarmony device logs for repeated segmentation faults, SIGSEGV signals, or abort traces tied to pre-installed app processes.
- Baseline the expected inter-process communication patterns of pre-installed apps and alert on deviations that suggest input fuzzing or crafted payload delivery.
- Inspect installed application inventories for third-party apps requesting or interacting with pre-installed app interfaces in unexpected ways.
Monitoring Recommendations
- Forward OpenHarmony device telemetry and crash reports to a central logging platform for correlation across the fleet.
- Track OpenHarmony version distribution across managed devices and flag any device still running v5.0.3 or earlier.
- Review vendor security bulletins from OpenAtom for follow-on advisories that may extend the affected version range.
How to Mitigate CVE-2025-27132
Immediate Actions Required
- Upgrade OpenHarmony to a fixed release beyond v5.0.3 as published by OpenAtom in the security disclosure.
- Inventory all devices, development boards, and products running OpenHarmony and prioritize patching those exposed to untrusted local applications.
- Restrict installation of untrusted third-party applications on affected devices until patches are deployed.
Patch Information
OpenAtom addresses the vulnerability in OpenHarmony releases published after v5.0.3. Consult the OpenHarmony Security Disclosure for the specific commit references and fixed build identifiers, then apply the corresponding device firmware or system update from the device manufacturer.
Workarounds
- Limit device use to trusted, signed applications and block sideloading where possible.
- Enforce application isolation and least-privilege policies for any locally installed code on OpenHarmony devices.
- Disable or remove non-essential pre-installed applications identified in the OpenAtom advisory when a patch cannot be applied immediately.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
