Home/CVE/Zyxel Multiple Firewalls OS Command Injection Vulnerability
CVE

CVE-2022-30525

Zyxel Multiple Firewalls OS Command Injection Vulnerability

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.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94445
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
▤

Affected Products & Versions

16
zyxel usg flex 100w firmware>= 5.00 and < 5.30
zyxel usg flex 200 firmware>= 5.00 and < 5.30
zyxel usg flex 500 firmware>= 5.00 and <= 5.30
zyxel usg flex 700 firmware>= 5.00 and < 5.30
zyxel vpn100 firmware>= 4.60 and < 5.30
zyxel vpn1000 firmware>= 4.60 and < 5.30
zyxel vpn300 firmware>= 4.60 and < 5.30
zyxel vpn50 firmware>= 4.60 and < 5.30
⚠

Public Exploits & PoCs

6
remoteZyxel USG FLEX 5.21 - OS Command Injection2022-06-03
nucleiZyxel Firewall - OS Command Injectioncritical
pocpacketstormsecurity.com · Zyxel-Remote-Command-Execution.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Zyxel-USG-FLEX-5.21-Command-Injection.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlpacketstormsecurity.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT [Rapid7] Zyxel ZTP setWanPortSt mtu Parameter Exploit Attempt (CVE-2022-30525)misc-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

9.8
CRITICAL · 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 NVD12 May 2022 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
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.
⚑

Vendor Advisories

1
cisaKEV-CVE-2022-30525
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtmlVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-30525US Government Resource
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