CVE-2023-22913

HIGH

Zyxel USG FLEX and VPN Series Firmware 4.50-5.35 - Authenticated Command Injection via account_operator.cgi

Title source: llm

Description

A post-authentication command injection vulnerability in the “account_operator.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow a remote authenticated attacker to modify device configuration data, resulting in denial-of-service (DoS) conditions on an affected device.

References (1)

Core 1

Core References

Vendor Advisory

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-of-firewalls-and-aps

Scores

CVSS v3 8.1

EPSS 0.0067

EPSS Percentile 71.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-77

Status published

Products (11)

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 4.50 - 5.35

zyxel/usg_flex_50w_firmware 4.50 - 5.35

zyxel/usg_flex_700_firmware 4.50 - 5.35

zyxel/vpn1000_firmware 4.50 - 5.35

zyxel/vpn100_firmware 4.50 - 5.35

zyxel/vpn300_firmware 4.50 - 5.35

... and 1 more

Published Apr 24, 2023

Tracked Since Feb 18, 2026