CVE-2021-33971

CVE-2021-33971 is a set of buffer overflow vulnerabilities impacting Qihoo 360 Safeguard, Total Security, and their browsers. Exploitation can lead to arbitrary code execution, either remotely by opening a malicious link in the browser or locally by executing a crafted program. With a CVSS score of 7.8 (High), the vulnerability has a low attack complexity and requires no user interaction for browser-based attacks, potentially leading to full compromise and persistence, even bypassing the antivirus's own scanning. While the vendor has patched these issues, there is no public exploit code, active exploitation, or significant community discussion reported.