SonicWall SMA1000 Authentication Bypass

Two-factor authentication bypass in SonicWall SMA1000 SSL-VPN allows remote attackers with valid SSLVPN credentials to circumvent TOTP requirements via Unicode encoding manipulation. Affects SMA1000 versions 12.5.0-02283 and 12.4.3-03245 and earlier. Requires high-privilege (PR:H) authenticated access but enables complete authentication bypass (CVSS 7.2). Low EPSS score (0.03%, 10th percentile) indicates minimal observed exploitation likelihood. No public exploit code identified at time of analysis.

Remote authenticated SonicWall SMA1000 SSLVPN administrators can bypass AMC TOTP (Time-based One-Time Password) authentication via improper handling of Unicode encoding, allowing high-privileged attackers to achieve authentication bypass on affected appliances. CVSS 6.6 reflects high-privileged requirement (PR:H) and high attack complexity (AC:H), limiting real-world exploitation despite total technical impact. EPSS score of 0.03% (10th percentile) indicates this vulnerability is unlikely to be exploited in widespread automated attacks, suggesting it requires specific attacker knowledge of Unicode encoding techniques and admin-level access.