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CVSS: 6.5EPSS: 0%CPEs: 64EXPL: 0

24 May 2022 — A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, and VPN series firmware versions 4.32 through 5.21, that could allow an authenticated attacker to bypass the second authentication phase to connect the IPsec VPN server even though the two-factor authentication (2FA) was enabled. Se ha detect... • https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml • CWE-287: Improper Authentication •

CVSS: 6.1EPSS: 0%CPEs: 64EXPL: 0

24 May 2022 — A cross-site scripting vulnerability was identified in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.35 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.35 through 5.20, and VPN series firmware versions 4.35 through 5.20, that could allow an attacker to obtain some information stored in the user's browser, such as cookies or session tokens, via a malicious script. Se identificó una vulnerabilidad de tipo cross-site scripting en el programa CG... • https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') •

CVSS: 7.8EPSS: 0%CPEs: 145EXPL: 0

24 May 2022 — Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series firmware versions 4.32 through 5.21, VPN series firmware versions 4.30 through 5.21, NSG series firmware versions 1.00 through 1.33 Patch 4, NXC2500 firmware version 6.10(AAIG.3) and earlier versions, NAP203 firmware version 6.25(ABFA.7) and earlier versions, NWA50AX firmware version 6.25(ABYW.5) and earl... • http://packetstormsecurity.com/files/167464/Zyxel-Buffer-Overflow-Format-String-Command-Injection.html • CWE-20: Improper Input Validation •

CVSS: 10.0EPSS: 97%CPEs: 32EXPL: 18

12 May 2022 — 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 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 thro... • https://github.com/jbaines-r7/victorian_machinery • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •

CVSS: 9.8EPSS: 9%CPEs: 48EXPL: 0

28 Mar 2022 — 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 versions V1.20 through V1.33 Patch 4, which could allow an attacker to bypass the web authentication and obtain administrative access of the device. Una vulnerabilidad de omisión de autenticación en el programa CGI de... • https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml • CWE-287: Improper Authentication •

CVSS: 9.8EPSS: 0%CPEs: 74EXPL: 0

02 Jul 2021 — An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP, and VPN series firmware versions 4.35 through 5.01, which could allow a remote attacker to execute arbitrary commands on an affected device. Una vulnerabilidad de omisión de la autenticación en la interfaz de administración basada en web de Zyxel USG/Zywall series versiones de firmware 4.35 hasta 4.64 y USG Flex, ATP, y VPN versiones de firmware 4.35... • https://www.zyxel.com/support/Zyxel_security_advisory_for_attacks_against_security_appliances.shtml • CWE-287: Improper Authentication •

CVSS: 9.0EPSS: 0%CPEs: 13EXPL: 0

27 Dec 2020 — Certain Zyxel products allow command injection by an admin via an input string to chg_exp_pwd during a password-change action. This affects VPN On-premise before ZLD V4.39 week38, VPN Orchestrator before SD-OS V10.03 week32, USG before ZLD V4.39 week38, USG FLEX before ZLD V4.55 week38, ATP before ZLD V4.55 week38, and NSG before 1.33 patch 4. Determinados productos Zyxel permiten una inyección de comandos por un administrador por medio de una cadena de entrada a la función chg_exp_pwd durante una acción de... • https://www.zyxel.com/support/Zyxel-security-advisory-for-command-injection-vulnerability-of-firewalls.shtml • CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') •

CVSS: 9.8EPSS: 0%CPEs: 228EXPL: 0

27 Nov 2020 — A stack-based buffer overflow in fbwifi_continue.cgi on Zyxel UTM and VPN series of gateways running firmware version V4.30 through to V4.55 allows remote unauthenticated attackers to execute arbitrary code via a crafted http packet. Un desbordamiento de búfer en la región stack de la memoria en el archivo fbwifi_continue.cgi en Zyxel serie UTM y VPN de puertas de enlace que ejecutan la versión de firmware V4.30 hasta la V4.55, lo que permite a atacantes remotos no autenticados ejecutar código arbitrario po... • https://businessforum.zyxel.com/categories/security-news-and-release • CWE-787: Out-of-bounds Write •

CVSS: 8.8EPSS: 0%CPEs: 4EXPL: 1

10 Nov 2018 — ZyXEL ZyWALL USG 2.12 AQQ.2 and 3.30 AQQ.7 devices are affected by a CSRF vulnerability via a cgi-bin/zysh-cgi cmd action to add a user account. This account's access could, for example, subsequently be used for stored XSS. Los dispositivos ZyXEL ZyWALL USG 2.12 AQQ.2 y 3.30 AQQ.7 se ven afectados por una vulnerabilidad Cross-Site Request Forgery (CSRF) mediante una acción cmd en cgi-bin/zysh-cgi para añadir una cuenta de usuario. El acceso a la cuenta podría, por ejemplo, usarse en consecuencia para Cross-... • https://www.shellcode.it/article/cve-2017-17550 • CWE-352: Cross-Site Request Forgery (CSRF) •

CVSS: 5.9EPSS: 0%CPEs: 34EXPL: 0

15 Aug 2018 — ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections. Los dispositivos ZyXEL de la serie ZyWALL/USG tienen una vulnerabilidad de Bleichenbacher en su implementación de handshake de intercambio de claves de Internet (IKE) utilizado para conexiones VPN basadas en IPsec. • ftp://ftp.zyxel.com/USG110/firmware/USG110_4.32%28AAPH.0%29C0_2.pdf •