CVE-2022-30525 on CISA KEV

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 th

01What CISA says about this vulnerability

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…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.zyxel.com — https://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-v…
• packetstormsecurity.com — http://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.html
• packetstormsecurity.com — http://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-C…
• packetstormsecurity.com — http://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injectio…
• packetstormsecurity.com — http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Zyxel	USG FLEX 100(W) firmware	5.00 through 5.21 Patch 1
Zyxel	USG FLEX 200 firmware	5.00 through 5.21 Patch 1
Zyxel	USG FLEX 500 firmware	5.00 through 5.21 Patch 1
Zyxel	USG FLEX 700 firmware	5.00 through 5.21 Patch 1
Zyxel	ATP series firmware	5.10 through 5.21 Patch 1
Zyxel	VPN series firmware	4.60 through 5.21 Patch 1
Zyxel	USG FLEX 50(W) firmware	5.10 through 5.21 Patch 1
Zyxel	USG 20(W)	VPN firmware — 5.10 through 5.21 Patch 1

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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