Zyxel Vulnerabilities and Affected Products
Vulnerabilities associated with CPE zhttpd Webserver.
Products
Clear product- USG FLEX series firmware51 vulnerabilities
- ATP series firmware49 vulnerabilities
- VPN series firmware37 vulnerabilities
- USG FLEX 50(W) series firmware28 vulnerabilities
- USG20(W)-VPN series firmware28 vulnerabilities
- NAS326 firmware15 vulnerabilities
- NAS542 firmware14 vulnerabilities
- USG FLEX 50(W) firmware11 vulnerabilities
- nas326_firmware9 vulnerabilities
- nas542_firmware9 vulnerabilities
- usg_flex_50w_firmware9 vulnerabilities
- USG/ZyWALL series firmware8 vulnerabilities
- USG20(W)-VPN firmware8 vulnerabilities
- VMG8825-T50K firmware8 vulnerabilities
- VMG3625-T50B firmware7 vulnerabilities
- WAC500 firmware7 vulnerabilities
- atp800_firmware6 vulnerabilities
- usg_flex_700h_firmware6 vulnerabilities
- Multiple Firewalls5 vulnerabilities
- NBG-418N v2 firmware5 vulnerabilities
- NR7101 firmware5 vulnerabilities
- NWA50AX firmware5 vulnerabilities
- usg_flex_firmware5 vulnerabilities
- WBE660S firmware5 vulnerabilities
- ZyWALL/USG series firmware5 vulnerabilities
| Vulnerability | Title and context | CVSS | EPSS | PoCs | Signals | STIX action |
|---|---|---|---|---|---|---|
CVE-2025-7673CRITICAL | Zyxel emg3525-t50b_firmware Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request. CWE-120Jul 16, 2025 | CVSS9.8v3.1 | EPSS0.545% | PoCs0 | SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templates | STIX |