Description
A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.
References (1)
Core 1
Core References
Scores
CVSS v3
8.8
EPSS
0.0019
EPSS Percentile
40.0%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-78
Status
published
Products (15)
zyxel/usg_2200-vpn_firmware
4.20 - 5.37
zyxel/usg_flex_100_firmware
4.50 - 5.37
zyxel/usg_flex_100w_firmware
4.50 - 5.37
zyxel/usg_flex_200_firmware
4.50 - 5.37
zyxel/usg_flex_500_firmware
4.50 - 5.37
zyxel/usg_flex_50_firmware
4.50 - 5.37
zyxel/usg_flex_50w_firmware
4.50 - 5.37
zyxel/usg_flex_700_firmware
4.50 - 5.37
zyxel/zywall_vpn100_firmware
4.20 - 5.37
zyxel/zywall_vpn2s_firmware
4.20 - 5.37
... and 5 more
Published
Jul 17, 2023
Tracked Since
Feb 18, 2026