Description
A buffer overflow vulnerability in the “fbwifi_forward.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.30 through 5.35, USG20(W)-VPN firmware versions 4.30 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow a remote unauthenticated attacker to cause DoS conditions by sending a crafted HTTP request if the Facebook WiFi function were enabled on an affected device.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Zyxel | USG FLEX series firmware | 4.50 through 5.35 | — |
| Zyxel | USG FLEX 50(W) firmware | 4.30 through 5.35 | — |
| Zyxel | USG20(W)-VPN firmware | 4.30 through 5.35 | — |
| Zyxel | VPN series firmware | 4.30 through 5.35 | — |
Advisories 1
- WID-SEC-2023-1070 Zyxel Firewalls: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 1, 2023