Executive brief
A security flaw in SonicWall SMA 1000 series appliances could allow an administrator to bypass multi-factor authentication (TOTP) when accessing the management console. These appliances are used to provide secure remote access to corporate networks. If exploited, an attacker who already has administrative credentials could gain full access to the management interface without providing the required secondary security code.
Technical details
A vulnerability exists in the SonicWall SMA 1000 series appliances due to improper handling of Unicode encoding (CWE-176) within the Aventail Management Console (AMC). A remote attacker with existing administrative privileges can exploit this flaw to bypass Time-based One-Time Password (TOTP) authentication requirements. The attack requires high privileges and has high complexity, as it involves manipulating Unicode strings to circumvent the secondary authentication check. Successful exploitation results in a complete bypass of MFA for the administrative interface, granting the attacker full control over the appliance configuration.
Affected products
- SonicWall SMA 1000 series
Timeline
- 2026-04-09: disclosed
- 2026-04-09: advisory