CVE-2025-14817: Transsion Hios Auth Bypass Vulnerability

CVE-2025-14817 Overview

CVE-2025-14817 is a missing authorization vulnerability [CWE-862] in Transsion HiOS affecting the com.transsion.tranfacmode.entrance.main.MainActivity component. The component lacks permission controls, allowing any third-party application installed on the device to construct an intent that directly enables Android Debug Bridge (ADB) debugging functionality. No user interaction is required to trigger this behavior. The flaw affects Transsion HiOS 14.0.0 running on the Tecno Pova 6 Pro 5G handset and potentially other HiOS-based devices.

Critical Impact
A malicious app installed on a vulnerable device can silently enable ADB debugging, exposing the device to expanded local attack surface and data access without alerting the user.

Affected Products

Transsion HiOS 14.0.0
Transsion Tecno Pova 6 Pro 5G
Devices shipping the vulnerable com.transsion.tranfacmode package

Discovery Timeline

2025-12-17 - CVE-2025-14817 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-14817

Vulnerability Analysis

The vulnerability resides in the com.transsion.tranfacmode package, which is a factory-mode utility preinstalled on Transsion HiOS devices. Its MainActivity class is exported without permission checks or signature restrictions in the Android manifest. Any application on the device can therefore invoke it using a standard Intent.

Invoking this activity toggles ADB debugging functionality on the device. ADB, when enabled, permits shell-level command execution, application installation, and file system access over USB or network. The Transsion factory-mode component was intended for internal manufacturing workflows but was left reachable in production firmware.

The CWE-862 classification reflects the absence of authorization enforcement on a sensitive administrative code path. The attack does not require the invoking application to hold privileged Android permissions such as WRITE_SECURE_SETTINGS, which would normally be required to modify developer options.

Root Cause

The MainActivity component is declared with android:exported="true" (implicitly or explicitly) and lacks an android:permission attribute or runtime caller validation. Transsion did not restrict access to system UID callers or apps signed with the platform key. This design allows arbitrary third-party apps to reach functionality that should be gated behind manufacturer or system-level trust boundaries.

Attack Vector

A malicious application installed through any distribution channel can craft an explicit intent targeting com.transsion.tranfacmode/.entrance.main.MainActivity and call startActivity(). The factory-mode component processes the intent and enables ADB without prompting the user. Once ADB is active, an attacker with local access, a compromised companion app, or network reachability to the debug port can execute further stages of the attack chain. Details of the affected component and remediation guidance are available in the Tecno Security Blog Post.

No public proof-of-concept code is available in the referenced advisories.

Detection Methods for CVE-2025-14817

Indicators of Compromise

Unexpected activation of ADB debugging on Transsion HiOS devices without user interaction in Developer Options
Presence of unknown third-party applications that reference com.transsion.tranfacmode in their manifest queries or intent filters
Anomalous adb connections originating from managed mobile endpoints

Detection Strategies

Audit installed applications on HiOS devices for intents targeting com.transsion.tranfacmode.entrance.main.MainActivity
Use Mobile Device Management (MDM) posture checks to flag devices where ADB has been enabled outside of approved change windows
Review application static analysis reports for the presence of the target component name in decoded intents

Monitoring Recommendations

Alert on new USB debugging sessions initiated on managed Transsion devices
Log and inspect network traffic on TCP port 5555, which is used by ADB over TCP/IP
Track firmware versions across the fleet and prioritize devices still running HiOS 14.0.0

How to Mitigate CVE-2025-14817

Immediate Actions Required

Apply the Transsion security update referenced on the Tecno Security Updates Page as soon as it is available for the affected model
Restrict installation of untrusted third-party applications on affected HiOS devices through MDM policy
Disable USB debugging and OEM unlocking in Developer Options and enforce this state via device management profiles

Patch Information

Transsion has published advisory information through the Tecno Security Response Center. Refer to the Tecno Security Blog Post for the specific firmware build that resolves the missing permission control on com.transsion.tranfacmode. Users should install the corresponding over-the-air (OTA) update for the Tecno Pova 6 Pro 5G and other affected HiOS handsets.

Workarounds

Enroll devices in an MDM solution and enforce a policy that blocks installation of applications from unknown sources
Monitor for and remove any application declaring intents that target the com.transsion.tranfacmode package
Where feasible, avoid using affected HiOS 14.0.0 devices for sensitive workloads until the vendor patch is applied

bash

# Configuration example: audit ADB state and factory-mode component on a connected device
adb shell settings get global adb_enabled
adb shell pm dump com.transsion.tranfacmode | grep -E "exported|permission|MainActivity"