Zyxel - Authentication Bypass

An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 through 5.20, and NSG series firmware...

Zyxel NBG2105 V1.00(AAGU.2)C0 - Authentication Bypass

Zyxel NBG2105 V1.00AAGU.2C0 devices are susceptible to authentication bypass vulnerabilities because setting the login cookie to 1 provides administrator access. id: CVE-2021-3297 info: name: Zyxel NBG2105 V1.00AAGU.2C0 - Authentication Bypass author: gy741 severity: high description: Zyxel NBG21...

Zyxel ZyWal/USG/UAG Devices - Cross-Site Scripting

Zyxel ZyWall, USG, and UAG devices allow remote attackers to inject arbitrary web script or HTML via the errmsg parameter freetimefailed.cgi CGI program, aka reflective cross-site scripting. id: CVE-2019-12581 info: name: Zyxel ZyWal/USG/UAG Devices - Cross-Site Scripting author: n-thumann...

Zyxel - Cross-Site Scripting

Zyxel ATP200, ATP500, ATP800, USG20-VPN, USG20W-VPN, USG40, USG40W, USG60, USG60W, USG110, USG210, USG310, USG1100, USG1900, USG2200-VPN, ZyWALL 110, ZyWALL 310, and ZyWALL 1100 devices contain a reflected cross-site scripting vulnerability on the security firewall login page via the mpidx...

Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting

ZyXEL ZyWALL 2 Plus Internet Security Appliance contains a cross-site scripting vulnerability. Insecure URI handling leads to bypass of security restrictions, which allows an attacker to execute arbitrary JavaScript codes to perform multiple attacks. id: CVE-2021-46387 info: name: Zyxel ZyWALL 2...

Zyxel ZyWall UAG/USG - Account Creation Access

Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator via the "Free Time" component. This can lead to unauthorized network access or DoS attacks. id: CVE-2019-12583 info: name: Zyxel ZyWall UAG/USG - Account Creation...

ZyXel USG - Hardcoded Credentials

A hardcoded credential vulnerability was identified in the 'zyfwp' user account in some Zyxel firewalls and AP controllers. The account was designed to deliver automatic firmware updates to connected access points through FTP. id: CVE-2020-29583 info: name: ZyXel USG - Hardcoded Credentials autho...

Zyxel VMG1312-B10D 5.13AAXA.8 - Local File Inclusion

Zyxel VMG1312-B10D 5.13AAXA.8 is susceptible to local file inclusion. A remote unauthenticated attacker can send a specially crafted URL request containing "dot dot" sequences /../, conduct directory traversal attacks, and view arbitrary files. id: CVE-2018-19326 info: name: Zyxel VMG1312-B10D...

Zyxel NAS326 Firmware < V5.21(AAZF.17)C0 - NsaRescueAngel Backdoor Account

The command injection vulnerability in the CGI program "remotehelp-cgi" in Zyxel NAS326 firmware versions before V5.21AAZF.17C0 and NAS542 firmware versions before V5.21ABAG.14C0 could allow an unauthenticated attacker to execute some operating system OS commands by sending a crafted HTTP POST...

Zyxel Firewall - OS Command Injection

An OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100W 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...

Zyxel NAS Firmware 5.21- Remote Code Execution

Multiple Zyxel network-attached storage NAS devices running firmware version 5.21 contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable device. Zyxel NAS devices achieve authentication by using th...

Zyxel NAS326 Firmware < V5.21(AAZF.17)C0 - Command Injection

The command injection vulnerability in the “setCookie” parameter in Zyxel NAS326 firmware versions before V5.21AAZF.17C0 and NAS542 firmware versions before V5.21ABAG.14C0 could allow an unauthenticated attacker to execute some operating system OS commands by sending a crafted HTTP POST request...

CVE-2026-7273

A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90ABTQ.1C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request...

CVE-2026-7273

A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90ABTQ.1C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request...

EUVD-2026-37030

A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90ABTQ.1C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request...

CVE-2026-7273

CVE-2026-7273 affects Zyxel GS1900-48HPv2 devices with firmware up to 2.90(ABTQ.1)C0. The flaw is a stack-based buffer overflow in the CGI program, enabling a LAN-based, unauthenticated attacker to potentially execute OS commands via a crafted HTTP request. Impact is described in the CVE metrics ...

PT-2026-49603

Name of the Vulnerable Software and Affected Versions Zyxel GS1900-48HPv2 versions prior to 2.90ABTQ.1C0 Description A stack-based buffer overflow exists in the CGI program. This flaw allows an unauthenticated attacker on the local area network LAN to potentially execute operating system commands...

CVE-2026-7257

UNSUPPORTED WHEN ASSIGNED An insecure storage of sensitive information vulnerability in the configuration file of Zyxel WRE6505 v2 firmware version V1.00ABDV.3C0 could allow a local attacker with administrator privileges to download and decrypt a backup configuration file...

CVE-2026-7255

UNSUPPORTED WHEN ASSIGNED An improper restriction of excessive authentication attempts vulnerability in the web management interface of Zyxel WRE6505 v2 firmware version V1.00ABDV.3C0 could allow an adjacent attacker on the LAN to brute-force the password and bypass authentication...

CVE-2026-3871

A buffer overflow vulnerability in the UPnP DeletePortMapping command in Zyxel VMG4005-B50B firmware versions through 5.13ABRL.5.4C0 could allow an adjacent attacker to trigger a temporary denial-of-service DoS condition affecting the UPnP function of the affected device...