# CVE-2022-30525: Zyxel Multiple Firewalls OS Command Injection Vulnerability

> CVE-2022-30525: Zyxel Multiple Firewalls OS Command Injection Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2022-30525
Last updated: 2025-10-21T23:15:39Z

- Published: 2022-05-12 13:05 UTC · Updated: 2025-10-21 23:15 UTC · Assigner: Zyxel
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 99.9%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-16, federal due date 2022-06-06, ransomware use: Unknown
- CWE: CWE-78

## Description

A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Zyxel: ATP series firmware
- Zyxel: USG 20(W)-VPN firmware
- Zyxel: USG FLEX 100(W) firmware
- Zyxel: USG FLEX 200 firmware
- Zyxel: USG FLEX 500 firmware
- Zyxel: USG FLEX 50(W) firmware
- Zyxel: USG FLEX 700 firmware
- Zyxel: VPN series firmware

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2022-30525)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2022-30525)
- [http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.html](http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.html)
- [http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.html](http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.html)
- [http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.html](http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.html)
- [http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.html](http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.html)
- [https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtml](https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtml)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2022-30525 · Markdown: https://rewindex.com/cve/CVE-2022-30525.md · JSON: https://rewindex.com/api/v1/cves/CVE-2022-30525 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:50.361Z