CVE-2023-22915

published 2023-04-24

CVE-2023-22915: 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…

Priority P3 46 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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

16 ranges

Vendor	Product	Version range	Fixed in
zyxel	usg20_vpn_firmware	—	—
zyxel	usg_20w-vpn_firmware	4.30 – 5.35	—
zyxel	usg_flex_100_firmware	4.50 – 5.35	—
zyxel	usg_flex_100w_firmware	4.50 – 5.35	—
zyxel	usg_flex_200_firmware	4.50 – 5.35	—
zyxel	usg_flex_500_firmware	4.50 – 5.35	—
zyxel	usg_flex_50_firmware	—	—
zyxel	usg_flex_50_firmware	4.50 – 5.35	—
zyxel	usg_flex_50w_firmware	4.30 – 5.35	—
zyxel	usg_flex_700_firmware	4.50 – 5.35	—
zyxel	usg_flex_series_firmware	—	—
zyxel	vpn1000_firmware	4.50 – 5.35	—
zyxel	vpn100_firmware	4.50 – 5.35	—
zyxel	vpn300_firmware	4.50 – 5.35	—
zyxel	vpn50_firmware	4.50 – 5.35	—
zyxel	vpn_series_firmware	—	—

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-120