CVE-2022-30525A 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 fi…
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It affects Zyxel USG FLEX 100(W) firmware and 20 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since May 16, 2022; federal agencies had to remediate by Jun 6, 2022. Treat that date as your deadline.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-78
- Known exploited
- Added to CISA KEV May 16, 2022; federal remediation due Jun 6, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 99.94% (percentile 100)
- Assigned by
- Zyxel
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Zyxel USG FLEX 100(W) firmware zyxel:usg_flex_100_w_firmware (from the name) | 5.00 through 5.21 Patch 1 | CNA record |
Zyxel USG FLEX 200 firmware zyxel:usg_flex_200_firmware (from the name) | 5.00 through 5.21 Patch 1 | CNA record |
Zyxel USG FLEX 500 firmware zyxel:usg_flex_500_firmware (from the name) | 5.00 through 5.21 Patch 1 | CNA record |
Zyxel USG FLEX 700 firmware zyxel:usg_flex_700_firmware (from the name) | 5.00 through 5.21 Patch 1 | CNA record |
Zyxel ATP series firmware zyxel:atp_series_firmware (from the name) | 5.10 through 5.21 Patch 1 | CNA record |
Zyxel VPN series firmware zyxel:vpn_series_firmware (from the name) | 4.60 through 5.21 Patch 1 | CNA record |
Zyxel USG FLEX 50(W) firmware zyxel:usg_flex_50_w_firmware (from the name) | 5.10 through 5.21 Patch 1 | CNA record |
Zyxel USG 20(W)-VPN firmware zyxel:usg_20_w_vpn_firmware (from the name) | 5.10 through 5.21 Patch 1 | CNA record |
zyxel usg_flex_100w_firmware zyxel:usg_flex_100w_firmware | from 5.00 before 5.30 | NVD |
zyxel usg_flex_200_firmware zyxel:usg_flex_200_firmware | from 5.00 before 5.30 | NVD |
zyxel usg_flex_500_firmware zyxel:usg_flex_500_firmware | from 5.00 through 5.30 | NVD |
zyxel usg_flex_700_firmware zyxel:usg_flex_700_firmware | from 5.00 before 5.30 | NVD |
zyxel vpn100_firmware zyxel:vpn100_firmware | from 4.60 before 5.30 | NVD |
zyxel vpn1000_firmware zyxel:vpn1000_firmware | from 4.60 before 5.30 | NVD |
zyxel vpn300_firmware zyxel:vpn300_firmware | from 4.60 before 5.30 | NVD |
zyxel vpn50_firmware zyxel:vpn50_firmware | from 4.60 before 5.30 | NVD |
zyxel atp100_firmware zyxel:atp100_firmware | from 5.10 before 5.30 | NVD |
zyxel atp100w_firmware zyxel:atp100w_firmware | from 5.10 before 5.30 | NVD |
zyxel atp200_firmware zyxel:atp200_firmware | from 5.10 before 5.30 | NVD |
zyxel atp500_firmware zyxel:atp500_firmware | from 5.10 before 5.30 | NVD |
zyxel atp700_firmware zyxel:atp700_firmware | from 5.10 before 5.30 | NVD |
zyxel atp800_firmware zyxel:atp800_firmware | from 5.10 before 5.30 | NVD |
zyxel usg_flex_50w_firmware zyxel:usg_flex_50w_firmware | from 5.10 before 5.30 | NVD |
zyxel usg20w-vpn_firmware zyxel:usg20w-vpn_firmware | from 5.10 before 5.30 | NVD |
References
- https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtmlx-refsource-confirm, vendor-advisory
- http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.htmlx-refsource-misc, third-party-advisory, vdb-entry
- http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.htmlx-refsource-misc, exploit, third-party-advisory, vdb-entry
- http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.htmlx-refsource-misc, exploit, third-party-advisory, vdb-entry
- http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlx-refsource-misc, exploit, third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-30525us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.