Exclusive research found 9 critical system-level Android VoIP Zero-day vulnerabilities that allow attackers to perform malicious operations, including denying voice calls, caller ID spoofing, unauthorized call operations, DOS attack, and remote code execution. A Team of academics and researchers from OPPO ZIWU Cyber Security Lab, Chinese University of Hong Kong and Singapore Management University uncovered these serious Android vulnerabilities and successfully tested in Android version 7.0 to the recent 9.0.

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