CVE-2022-30525: Zyxel Multiple Firewalls OS Command Injection, actively exploited

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 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Zyxel Atp100 Firmware≥ 5.10 < 5.30

Zyxel Atp100w Firmware≥ 5.10 < 5.30

Zyxel Atp200 Firmware≥ 5.10 < 5.30

Zyxel Atp500 Firmware≥ 5.10 < 5.30

Zyxel Atp700 Firmware≥ 5.10 < 5.30

Zyxel Atp800 Firmware≥ 5.10 < 5.30

Zyxel Usg20w-vpn Firmware≥ 5.10 < 5.30

Zyxel Usg Flex 100w Firmware≥ 5.00 < 5.30

Zyxel Usg Flex 200 Firmware≥ 5.00 < 5.30

Zyxel Usg Flex 500 Firmware≥ 5.00 ≤ 5.30

Zyxel Usg Flex 50w Firmware≥ 5.10 < 5.30

Zyxel Usg Flex 700 Firmware≥ 5.00 < 5.30

Zyxel Vpn1000 Firmware≥ 4.60 < 5.30

Zyxel Vpn100 Firmware≥ 4.60 < 5.30

Zyxel Vpn300 Firmware≥ 4.60 < 5.30

Zyxel Vpn50 Firmware≥ 4.60 < 5.30

Remediation

Fixed in

Zyxel Atp100 Firmware≥ 5.30

Zyxel Atp100w Firmware≥ 5.30

Zyxel Atp200 Firmware≥ 5.30

Zyxel Atp500 Firmware≥ 5.30

Zyxel Atp700 Firmware≥ 5.30

Zyxel Atp800 Firmware≥ 5.30

Zyxel Usg20w-vpn Firmware≥ 5.30

Zyxel Usg Flex 100w Firmware≥ 5.30

Zyxel Usg Flex 200 Firmware≥ 5.30

Zyxel Usg Flex 50w Firmware≥ 5.30

Patch & vendor advisories

https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtml

References

http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.htmlThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.htmlExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.htmlExploitThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlExploitThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-30525US Government Resource
https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtmlVendor Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2022-30525 being actively exploited?

Yes. CVE-2022-30525 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 16 May 2022.

How severe is CVE-2022-30525?

CVE-2022-30525 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.9% probability of exploitation.

Which products are affected by CVE-2022-30525?

Affected products include Zyxel Atp100 Firmware, Zyxel Atp100w Firmware, Zyxel Atp200 Firmware, Zyxel Atp500 Firmware, Zyxel Atp700 Firmware, and 11 more.

How do I fix CVE-2022-30525?

Upgrade affected software to a fixed version, for example Zyxel Atp100 Firmware 5.30, Zyxel Atp100w Firmware 5.30, Zyxel Atp200 Firmware 5.30 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-30525 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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