CVE-2022-30525
Zyxel Multiple Firewalls OS Command Injection Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 6 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 99.94% probability · 100th percentile
- Public exploits
- 1 in Exploit-DB · first 3 June 2022
- CISA KEV
- Listed 16 May 2022 · due 6 June 2022
- Weakness
- CWE-78
- Affected
- zyxel/usg flex 100w firmware · zyxel/usg flex 200 firmware · zyxel/usg flex 500 firmware · zyxel/usg flex 700 firmware · zyxel/vpn100 firmware · zyxel/vpn1000 firmware · zyxel/vpn300 firmware · zyxel/vpn50 firmware · zyxel/atp100 firmware · zyxel/atp100w firmware · zyxel/atp200 firmware · zyxel/atp500 firmware · zyxel/atp700 firmware · zyxel/atp800 firmware · zyxel/usg flex 50w firmware · zyxel/usg20w-vpn firmware
- Source
- security@zyxel.com.tw
EPSS 99.9% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2022-30525
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlExploit, Third Party Advisory
- https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtmlVendor Advisory
- http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.htmlExploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlExploit, Third Party Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.