CVE-2024-11667

9.8 criticalKEVEPSS 2.9%

Critical (9.8) in Zyxel Multiple Firewalls. In CISA KEV since 2024-12-03, with known ransomware use. EPSS 2.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 2.9% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-11-01)
CISA KEV: listed 2024-12-03, due 2024-12-24, known ransomware use
CWE: CWE-22
Published: 2024-11-27
Modified: 2026-08-05
Record from: the NVD, synced 2026-10-19

Affected

zyxel:zld

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-protecting-against-recent-firewall-threats-11-27-2024
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-11667

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