CVE-2025-9558
📋 TL;DR
CVE-2025-9558 is a buffer overflow vulnerability in Zephyr RTOS's Bluetooth provisioning code that allows attackers to write data beyond allocated memory boundaries. This affects devices running Zephyr RTOS with Bluetooth provisioning enabled. Attackers could potentially execute arbitrary code or crash affected devices.
💻 Affected Systems
- Zephyr RTOS
⚠️ 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 persistent backdoor installation
Likely Case
Device crash or denial of service through memory corruption, potentially requiring physical reset
If Mitigated
Limited impact with proper network segmentation and Bluetooth security controls
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of the provisioning process
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub advisory for specific commit
Vendor Advisory: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-8wvr-688x-68vr
Restart Required: Yes
Instructions:
1. Update Zephyr RTOS to latest version
2. Apply security patch from GitHub advisory
3. Rebuild and redeploy firmware
4. Restart affected devices
🔧 Temporary Workarounds
Disable Bluetooth provisioning
allDisable the vulnerable provisioning feature if not required
CONFIG_BT_MESH_PROV=n in Kconfig
Network segmentation
allIsolate Bluetooth devices from critical networks
🧯 If You Can't Patch
- Implement strict Bluetooth access controls and device whitelisting
- Monitor for abnormal Bluetooth provisioning attempts and device crashes
🔍 How to Verify
Check if Vulnerable:
Check if device uses Zephyr RTOS with Bluetooth provisioning enabled and version is unpatchedCheck Version:
Check Zephyr version in build configuration or device firmware infoVerify Fix Applied:
Verify Zephyr version includes the security fix commit and Bluetooth provisioning works without crashes📡 Detection & Monitoring
Log Indicators:
- Memory corruption errors
- Bluetooth provisioning failures
- Device crashes/reboots
Network Indicators:
- Abnormal Bluetooth provisioning packets
- Excessive Bluetooth connection attempts
SIEM Query:
device_logs: ("memory corruption" OR "buffer overflow" OR "panic") AND source:"zephyr_device"