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How the CVE Works
CVE-2025-20680 is a critical vulnerability in MediaTek’s Bluetooth driver, allowing an out-of-bounds write due to an incorrect bounds check. Attackers can exploit this flaw to execute arbitrary code with elevated privileges without user interaction. The vulnerability occurs when improperly validated input data is processed, leading to memory corruption. This enables local privilege escalation, potentially compromising the entire system. The flaw stems from insufficient validation in the driver’s packet handling logic, where maliciously crafted Bluetooth packets trigger the overflow.
DailyCVE Form
Platform: MediaTek Bluetooth Driver
Version: Pre-WCNCR00418044
Vulnerability: Out-of-Bounds Write
Severity: Critical
Date: 07/14/2025
Prediction: Patch expected by 08/15/2025
What Undercode Say
Check Bluetooth driver version dmesg | grep -i "Bluetooth" Debug memory corruption gdb -ex "disas vulnerable_function" /lib/modules/$(uname -r)/kernel/drivers/bluetooth/mediatek.ko
How Exploit
- Craft malicious Bluetooth packets triggering OOB write.
- Exploit memory corruption to gain root privileges.
- Bypass kernel protections via ROP chains.
Protection from this CVE
- Apply patch WCNCR00418044.
- Disable Bluetooth if unused.
- Enforce kernel ASLR & stack canaries.
Impact
- Full system compromise.
- Persistent backdoor installation.
- Bypass of security controls.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
