CVE-2024-11667 on CISA KEV

A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through V5.38, USG FLEX series firmware versions V5.00 through V5.38, USG FLEX 50(W) series firmware versions V5.10 through V5.38, and USG20(W)-VPN series firmware vers

01What CISA says about this vulnerability

A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through V5.38, USG FLEX series firmware versions V5.00 through V5.38, USG FLEX 50(W) series firmware versions V5.10 through V5.38, and USG20(W)-VPN series firmware versions V5.10 through V5.38 could allow an attacker to download or upload files via a crafted URL.

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

• www.zyxel.com — https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advis…

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	ATP series firmware	versions V5.00 through V5.38
Zyxel	USG FLEX series firmware	versions V5.00 through V5.38
Zyxel	USG FLEX 50(W) series firmware	versions V5.10 through V5.38
Zyxel	USG20(W)	VPN series firmware — versions V5.10 through V5.38

06Detection

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

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