CVE-2025-6093
📋 TL;DR
A critical stack-based buffer overflow vulnerability exists in the uYanki board-stm32f103rc-berial firmware's heartrate1_i2c_hal_write function. Attackers can exploit this by manipulating the 'num' argument to execute arbitrary code or crash the device. This affects all versions up to commit 84daed541609cb7b46854cc6672a275d1007e295 of this embedded system firmware.
💻 Affected Systems
- uYanki board-stm32f103rc-berial firmware
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, or device bricking.
Likely Case
Device crash or denial of service, potentially requiring physical reset or reflashing.
If Mitigated
Limited impact if proper input validation and memory protections are implemented.
🎯 Exploit Status
Exploitation requires understanding of embedded systems and buffer overflow techniques. No public exploits currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown (continuous delivery model)
Vendor Advisory: https://github.com/uYanki/board-stm32f103rc-berial/issues/3
Restart Required: Yes
Instructions:
1. Monitor GitHub repository for updates. 2. Rebuild firmware from latest source. 3. Flash updated firmware to device.
🔧 Temporary Workarounds
Disable vulnerable demo code
allRemove or disable the MAX30100 heart rate sensor demo functionality
Remove 7.Example/hal/i2c/max30100/Manual/demo2/ directory from firmware build
Add stack protection
allEnable compiler stack protection flags during firmware compilation
Add -fstack-protector-all to compiler flags
🧯 If You Can't Patch
- Network segmentation: Isolate affected devices from untrusted networks
- Input validation: Add bounds checking for the 'num' parameter in heartrate1_i2c_hal_write function
🔍 How to Verify
Check if Vulnerable:
Check if firmware includes commit 84daed541609cb7b46854cc6672a275d1007e295 or earlier in the board-stm32f103rc-berial repositoryCheck Version:
git log --oneline | head -1Verify Fix Applied:
Verify the heartrate1_i2c_hal_write function includes proper bounds checking on the 'num' parameter📡 Detection & Monitoring
Log Indicators:
- Device crashes or unexpected resets
- Memory access violation errors
Network Indicators:
- Unusual I2C bus traffic patterns
- Abnormal sensor data readings
SIEM Query:
Not applicable for embedded firmware