Description (CNA)
A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Zyxel / USG/ZyWALL series firmware | affected 4.32 through 4.71 |
| Zyxel / USG FLEX series firmware | affected 4.50 through 5.21 |
| Zyxel / ATP series firmware | affected 4.32 through 5.21 |
| Zyxel / VPN series firmware | affected 4.32 through 5.21 |
CWE
CWE-287
References
ADP enrichment
No English description supplied.