Zyxel · Multiple Firewalls
CVE-2022-30525
Zyxel Multiple Firewalls OS Command Injection Vulnerability
What it is
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: A command injection vulnerability in the CGI program of some Zyxel firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: June 6, 2022
- Added to the CISA list
- May 16, 2022
- Published
- May 12, 2022
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 99.9% in the top 0.1% of all known vulnerabilities
- Weakness
- CWE-78
- More details
- NVD · CVE.org · CISA
All references (5)
- https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.sht…
- 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/167372/Zyxel-USG-FLEX-5.21-Command-Injection.html
- http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.html
More exploited flaws from Zyxel
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Dec 3, 2024 | Path Traversal | Multiple Firewalls | High 7.5 | 2.9% |
| Jun 5, 2023 | Buffer Overflow | Multiple Firewalls | Critical 9.8 | 28% |
| Jun 5, 2023 | Buffer Overflow | Multiple Firewalls | Critical 9.8 | 29% |
| May 31, 2023 | OS Command Injection | Multiple Firewalls | Critical 9.8 | 99.3% |
| Sep 21, 2026 | Stack-Based Buffer Overflow | GS1900 Series Switches | High 8.8 | 2.8% |
| Feb 11, 2025 | DSL CPE OS Command Injection | DSL CPE Devices | High 8.8 | 21% |
| Feb 11, 2025 | DSL CPE OS Command Injection | DSL CPE Devices | High 8.8 | 23% |
| Sep 18, 2023 | Command Injection | EMG2926 Routers | High 8.8 | 33% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.