Home/CVE/A post-authentication command injection vulnerability in the “account_operator.cgi” CGI program of Zyxel USG FLEX se
CVE

CVE-2023-22913

A post-authentication command injection vulnerability in the “account_operator.cgi” CGI program of Zyxel USG FLEX se

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.

HIGH · CVSS 8.1 EPSS 0.00668
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
▤

Affected Products & Versions

11
zyxel usg flex 100 firmware>= 4.50 and <= 5.35
zyxel usg flex 100w firmware>= 4.50 and <= 5.35
zyxel usg flex 200 firmware>= 4.50 and <= 5.35
zyxel usg flex 50 firmware>= 4.50 and <= 5.35
zyxel usg flex 50w firmware>= 4.50 and <= 5.35
zyxel usg flex 500 firmware>= 4.50 and <= 5.35
zyxel usg flex 700 firmware>= 4.50 and <= 5.35
zyxel vpn100 firmware>= 4.50 and <= 5.35
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · security@zyxel.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Apr 2023 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-of-firewalls-and-apsVendor Advisory
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