Vulnerabilities (CVE)

Filtered by vendor Zyxel Subscribe
Total 303 CVE
CVE Vendors Products Updated CVSS v2 CVSS v3
CVE-2020-13364 1 Zyxel 8 Nas326, Nas326 Firmware, Nas520 and 5 more 2022-02-09 9.0 HIGH 8.8 HIGH
A backdoor in certain Zyxel products allows remote TELNET access via a CGI script. This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0.
CVE-2020-13365 1 Zyxel 8 Nas326, Nas326 Firmware, Nas520 and 5 more 2022-02-09 9.0 HIGH 8.8 HIGH
Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0.
CVE-2021-35032 1 Zyxel 24 Gs1900-10hp, Gs1900-10hp Firmware, Gs1900-16 and 21 more 2022-01-07 7.2 HIGH 7.8 HIGH
A vulnerability in the 'libsal.so' of the Zyxel GS1900 series firmware version 2.60 could allow an authenticated local user to execute arbitrary OS commands via a crafted function call.
CVE-2021-35031 1 Zyxel 28 Gs1900-10hp, Gs1900-10hp Firmware, Gs1900-16 and 25 more 2022-01-07 7.7 HIGH 8.0 HIGH
A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware, which could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.
CVE-2021-35035 1 Zyxel 2 Nbg6604, Nbg6604 Firmware 2022-01-07 4.0 MEDIUM 6.5 MEDIUM
A cleartext storage of sensitive information vulnerability in the Zyxel NBG6604 firmware could allow a remote, authenticated attacker to obtain sensitive information from the configuration file.
CVE-2021-35034 1 Zyxel 2 Nbg6604, Nbg6604 Firmware 2022-01-07 6.4 MEDIUM 9.1 CRITICAL
An insufficient session expiration vulnerability in the CGI program of the Zyxel NBG6604 firmware could allow a remote attacker to access the device if the correct token can be intercepted.
CVE-2021-35028 1 Zyxel 2 Zywall Vpn2s, Zywall Vpn2s Firmware 2021-10-02 7.2 HIGH 7.8 HIGH
A command injection vulnerability in the CGI program of the Zyxel VPN2S firmware version 1.12 could allow an authenticated, local user to execute arbitrary OS commands.
CVE-2021-35027 1 Zyxel 2 Zywall Vpn2s, Zywall Vpn2s Firmware 2021-10-02 5.0 MEDIUM 7.5 HIGH
A directory traversal vulnerability in the web server of the Zyxel VPN2S firmware version 1.12 could allow a remote attacker to gain access to sensitive information.
CVE-2021-35030 1 Zyxel 24 Gs1900-10hp, Gs1900-10hp Firmware, Gs1900-16 and 21 more 2021-08-13 2.3 LOW 4.3 MEDIUM
A vulnerability was found in the CGI program in Zyxel GS1900-8 firmware version V2.60, that did not properly sterilize packet contents and could allow an authenticated, local user to perform a cross-site scripting (XSS) attack via a crafted LLDP packet.
CVE-2020-20183 1 Zyxel 2 P1302-t10 V3, P1302-t10 V3 Firmware 2021-07-21 5.0 MEDIUM 7.5 HIGH
Insecure direct object reference vulnerability in Zyxel’s P1302-T10 v3 with firmware version 2.00(ABBX.3) and earlier allows attackers to gain privileges and access certain admin pages.
CVE-2020-24354 1 Zyxel 2 Vmg5313-b30b, Vmg5313-b30b Firmware 2021-07-21 6.5 MEDIUM 8.8 HIGH
Zyxel VMG5313-B30B router on firmware 5.13(ABCJ.6)b3_1127, and possibly older versions of firmware are affected by shell injection.
CVE-2020-15348 1 Zyxel 1 Cloud Cnm Secumanager 2021-07-21 10.0 HIGH 9.8 CRITICAL
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows use of live/CPEManager/AXCampaignManager/delete_cpes_by_ids?cpe_ids= for eval injection of Python code.
CVE-2019-15801 1 Zyxel 18 Gs1900-10hp, Gs1900-10hp Firmware, Gs1900-16 and 15 more 2021-07-21 5.0 MEDIUM 7.5 HIGH
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.
CVE-2021-35029 1 Zyxel 74 Usg100, Usg1000, Usg1000 Firmware and 71 more 2021-07-08 7.5 HIGH 9.8 CRITICAL
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.
CVE-2020-28899 1 Zyxel 6 Lte4506-m606, Lte4506-m606 Firmware, Lte7460-m608 and 3 more 2021-03-22 6.4 MEDIUM 9.1 CRITICAL
The Web CGI Script on ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices does not require authentication, which allows remote unauthenticated attackers (via crafted JSON action data to /cgi-bin/gui.cgi) to use all features provided by the router. Examples: change the router password, retrieve the Wi-Fi passphrase, send an SMS message, or modify the IP forwarding to access the internal network.
CVE-2021-3297 1 Zyxel 2 Nbg2105, Nbg2105 Firmware 2021-02-03 7.2 HIGH 7.8 HIGH
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to 1 provides administrator access.
CVE-2020-29299 1 Zyxel 7 Atp, Nsg, Nsg Firmware and 4 more 2021-01-05 9.0 HIGH 7.2 HIGH
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.
CVE-2020-24355 1 Zyxel 2 Vmg5313-b30b, Vmg5313-b30b Firmware 2020-09-11 10.0 HIGH 9.8 CRITICAL
Zyxel VMG5313-B30B router on firmware 5.13(ABCJ.6)b3_1127, and possibly older versions of firmware are affected by insecure permissions which allows regular and other users to create new users with elevated privileges. This is done by changing "FirstIndex" field in JSON that is POST-ed during account creation. Similar may also be possible with account deletion.
CVE-2019-15800 1 Zyxel 18 Gs1900-10hp, Gs1900-10hp Firmware, Gs1900-16 and 15 more 2020-08-24 10.0 HIGH 9.8 CRITICAL
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Due to lack of input validation in the cmd_sys_traceroute_exec(), cmd_sys_arp_clear(), and cmd_sys_ping_exec() functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call system() and execute arbitrary commands on the switches. (Note that these functions are currently not called in this version of the firmware, however an attacker could use other vulnerabilities to finally use these vulnerabilities to gain code execution.)
CVE-2019-12583 1 Zyxel 28 Uag2100, Uag2100 Firmware, Uag4100 and 25 more 2020-08-24 6.4 MEDIUM 9.1 CRITICAL
Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator. This can lead to unauthorised network access or Denial of Service.