CVE-2022-30525
CriticalExploitedPublic exploitA 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…
Published May 18, 2022 · Updated Oct 21, 2025 · Also known as TR-22-0352, TR-22-0367
Key Facts
Patch immediately- CVE-2022-30525 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Atp100 Firmware (Zyxel), Atp100w Firmware (Zyxel), Atp200 Firmware (Zyxel) and 18 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 14, 2022 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- Fixed versions are available, including Atp100 Firmware 5.30, Atp100w Firmware 5.30, Atp200 Firmware 5.30.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2022-30525 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | May 16, 2022 | Jun 6, 2022 | Not reported |
| Industry KEV feed | May 14, 2022 | Jun 6, 2022 | Known |
| CIRCL KEV | May 16, 2022 | Jun 6, 2022 | Not reported |
| ENISA EUVD | May 16, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
24 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Atp100 FirmwareZyxel | See advisory | 5.30 |
| Atp100w FirmwareZyxel | See advisory | 5.30 |
| Atp200 FirmwareZyxel | See advisory | 5.30 |
| Atp500 FirmwareZyxel | See advisory | 5.30 |
| Atp700 FirmwareZyxel | See advisory | 5.30 |
Patched Releases
Atp100 Firmware
5.30
Atp100w Firmware
5.30
Atp200 Firmware
5.30
Atp500 Firmware
5.30
Atp700 Firmware
5.30
Atp800 Firmware
5.30
Usg Flex 100w Firmware
5.30
USG FLEX 200 firmware
5.30
USG FLEX 500 firmware
<=5.30
Usg Flex 50w Firmware
5.30
USG FLEX 700 firmware
5.30
Usg20w-VPN Firmware
5.30
Vpn100 Firmware
5.30
Vpn1000 Firmware
5.30
Vpn300 Firmware
5.30
Vpn50 Firmware
5.30
Timeline
Added to Industry KEV feed
May 14, 2022
Added to CISA KEV
May 16, 2022
Added to CIRCL KEV
May 16, 2022
Added to ENISA EUVD
May 16, 2022
Publicly disclosed
May 18, 2022
Last updated
Oct 21, 2025
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttp://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.html
- advisoryhttps://gbhackers.com/critical-vulnerability-zyxel-firewall/
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-30525
- advisoryhttps://www.bleepingcomputer.com/news/security/hackers-are-exploiting-critical-bug-in-zyxel-firewalls-and-vpns/
- advisoryhttps://www.cyber.nj.gov/alerts-advisories/vulnerability-in-zyxel-firewall-and-vpn/
FAQ
Common Questions.
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) firm…
Affected: Atp100 Firmware (Zyxel); Atp100w Firmware (Zyxel); Atp200 Firmware (Zyxel), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 14, 2022 and is known to be used in ransomware campaigns.
Yes. It was added on May 16, 2022 with a federal remediation due date of Jun 6, 2022.
Public exploit code is available.
Fixed versions are available, including Atp100 Firmware 5.30, Atp100w Firmware 5.30, Atp200 Firmware 5.30.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2022-30525 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo