Zyxel Vulnerabilities


The analysis of the timeline helps to identify the required approach and handling of single vulnerabilities and vulnerability collections. This overview makes it possible to see less important slices and more severe hotspots at a glance. Initiating immediate vulnerability response and prioritizing of issues is possible.


The moderation team is working with the threat intelligence team to categorize software that is affected by security vulnerabilities. This helps to illustrate the assignment of these categories to determine the most affected software types.


ZyXEL CloudCNM SecuManager37
Zyxel VPN20
Zyxel USG FLEX19
Zyxel ATP18

Grouping vulnerabilities by products helps to get an overview. This makes it possible to determine an homogeneous landscape or the most important hotspots in heterogeneous landscapes.


Official Fix40
Temporary Fix1
Not Defined148

Vendors and researchers are eager to find countermeasures to mitigate security vulnerabilities. These can be distinguished between multiple forms and levels of remediation which influence risks differently.


Not Defined181

Researcher and attacker which are looking for security vulnerabilities try to exploit them for academic purposes or personal gain. The level and quality of exploitability can be distinguished to determine simplicity and strength of attacks.

Access Vector

Not Defined0

The approach a vulnerability it becomes important to use the expected access vector. This is typically via the network, local, or physically even.


Not Defined0

To exploit a vulnerability a certail level of authentication might be required. Vulnerabilities without such a requirement are much more popular.

User Interaction

Not Defined0

Some attack scenarios require some user interaction by a victim. This is typical for phishing, social engineering and cross site scripting attacks.

C3BM Index

Our unique C3BM Index (CVSSv3 Base Meta Index) cumulates the CVSSv3 Meta Base Scores of all entries over time. Comparing this index to the amount of disclosed vulnerabilities helps to pinpoint the most important events.

CVSSv3 Base


The Common Vulnerability Scoring System (CVSS) is an industry standard to define the characteristics and impacts of security vulnerabilities. The base score represents the intrinsic aspects that are constant over time and across user environments. Our unique meta score merges all available scores from different sources to aggregate to the most reliable result.

CVSSv3 Temp


The Common Vulnerability Scoring System (CVSS) uses temp scores to reflect the characteristics of a vulnerability that may change over time but not across user environments. This includes reporting confidence, exploitability and remediation levels. We do also provide our unique meta score for temp scores, even though other sources rarely publish them.



The moderation team is always defining the base vector and base score for an entry. These and all other available scores are used to generate the meta score.



The National Vulnerability Database (NVD) is also defining CVSS vectors and scores. These are usually not complete and might differ from VulDB scores.



A CVE Numbering Authority (CNA) is responsible for assigning new CVE entries. They might also include a CVSS score. These are usually not complete and might differ from VulDB scores.



Some vendors are willing to publish their own CVSS vectors and scores for vulnerabilities in their products. The coverage varies from vendor to vendor.



There are sometimes also security researcher which provide their own CVSS vectors and scores for vulnerabilities they have found and published.

Exploit 0-day


The moderation team is working with the threat intelligence team to determine prices for exploits. Our unique algorithm is used to identify the 0-day prices for an exploit, before it got distributed or became public. Calculated prices are aligned to prices disclosed by vulnerability broker and compared to prices we see on exploit markets.

Exploit Today


The 0-day prices do not consider time-relevant factors. The today price does reflect price impacts like disclosure of vulnerability details, alternative exploits, availability of countermeasures. These dynamic aspects might decrease the exploit prices over time. Under certain circumstances this happens very fast.

Exploit Market Volume

Our unique calculation of exploit prices makes it possible to forecast the expected exploit market volume. The calculated prices for all possible 0-day expoits are cumulated for this task. Comparing the volume to the amount of disclosed vulnerabilities helps to pinpoint the most important events.

🔴 CTI Activities

Our unique Cyber Threat Intelligence aims to determine the ongoing research of actors to anticipiate their acitivities. Observing exploit markets on the Darknet, discussions of vulnerabilities on mailinglists, and exchanges on social media makes it possible to identify planned attacks. Monitored actors and activities are classified whether they are offensive or defensive. They are also weighted as some actors are well-known for certain products and technologies. And some of their disclosures might contain more or less details about technical aspects and personal context. The world map highlights active actors in real-time.

Affected Products (144): 642R (1), AP Configurator (1), APT (1), ARMOR Z1 (2), ARMOR Z2 (2), ATP (18), ATP500 (1), AX7501-B0 (2), Armor X1 WAP6806 (1), Billion 5200W-T (6), C1000Z (1), CloudCNM SecuManager (37), DX5401-B0 (2), EMG2926 (1), FR1000Z (1), GS1200 (1), GS1510-16 (1), GS1900 (9), GS1900-8 (2), GS1900-24 (1), GS1920-24v2 (1), LTE3301-M209 (1), LTE3316-M604 (1), LTE4506-M606 (1), Multy X AC3000 (1), NAS (1), NAS326 (5), NAS 326 (5), NAS520 (2), NAS540 (4), NAS542 (3), NBG-418N (3), NBG-418N v2 (7), NBG-6604 (1), NBG2105 (1), NBG6604 (3), NBG6716 (1), NBG6818 (1), NBG7510 (1), NBG7815 (1), NR7101 (5), NSA221 (2), NSA310 (2), NSA320S (2), NSA325 (2), NSA325 V2 (2), NSG (1), NWA-1100-NH (2), NWA110AX (1), NWA1123-NI (1), NWA3560-N (1), O2 DSL Router Classic (1), P-330W router (2), P-335WT router (1), P-660HN-51 (1), P-660HN-T1 V2 (1), P-660HW (6), P-660HW-T1 (3), P-660HW D3 (1), P-660RU-T1 (1), P-663HN-51 (1), P-870H-51 (1), P-1302-T10D v3 (1), P-2602HW-D1A (3), P660 (1), P660HN-T1A (4), P660HN-T v1 (2), P660HN-T v2 (2), P660RT2 (2), P1302-T10 v3 (1), P2000W Wifi Phone (1), P8702N (1), PK5001Z (1), PMG2005-T20B (1), PMG5318-B20A (4), PMG5318-B20A GPON (1), Prestige (3), Prestige 310 (1), Prestige 642R (1), Prestige 642R-I (1), Prestige 660H-61 (1), Prestige 2000w V.1voip Wi-fi Phone (2), Prestige Router (1), Q1000 (1), SBG-3300 (2), SBG3300-N000 (1), SBG3300-NB00 (1), SBG3500-N000 (1), UAG (2), USG (13), USG20 (2), USG40 (1), USG50 (1), USG1900 (1), USG FLEX (19), USG FLEX 20 (1), USG FLEX 50 (3), USG FLEX 100 (3), USG FLEX 200 (3), USG FLEX 500 (3), USG FLEX 700 (3), USG Flex (2), USG ZyWALL (2), UTM (1), VMG1312-B10A (1), VMG1312-B10D (1), VMG1312-B30A (1), VMG1312-B30B (1), VMG3312 B10B (1), VMG3312-B10B (1), VMG3312-B10B DSL-491HNU-B1B (1), VMG3312-T20A (2), VMG4380-B10A (1), VMG5313-B30B (2), VMG8324-B10A (1), VMG8924-B10A (1), VMG8924-B30A (1), VPN (21), VPN2S (2), VPN On-premise (1), VPN Orchestrator (1), VSG1435-B101 DSL CPEs (1), WRE6505 (1), WSQ20 (1), WSQ50 (1), WSQ60 (1), WSR30 (1), Wireless N300 NetUSB (4), XGS2210-52HP (1), XGS2220-30 (1), XMG1930-30 (1), XS1930-10 (1), ZyNOS (12), ZyWALL (8), ZyWALL 2 Plus Internet Security Appliance (1), ZyWALL 10 (1), ZyWALL 100 (1), ZyWALL310 (1), ZyWALL1100 (1), ZyWALL USG (2), ZyWall (2), ZynOS (1), Zywall (3), Zywall 2 (4)

Link to Vendor Website: https://www.zyxel.com/

09/28/20236.55.9ZyXEL PMG2005-T20B login.asp buffer overflowRouter Operating SystemProof-of-ConceptNot Defined0.030.00087CVE-2023-43314
08/14/20235.45.4ZyXEL XGS2220-30/XMG1930-30/XS1930-10 Frames denial of serviceUnknownNot DefinedNot Defined0.070.00044CVE-2023-28768
08/14/20238.88.8ZyXEL NBG6604 NTP os command injectionRouter Operating SystemNot DefinedNot Defined0.040.00050CVE-2023-33013
07/18/20238.08.0Zyxel ATP/USG FLEX/VPN Access Point Management os command injectionNetwork Encryption SoftwareNot DefinedNot Defined0.030.00047CVE-2023-34141
07/18/20236.56.5Zyxel ATP/USG FLEX/VPN CAPWAP Daemon buffer overflowNetwork Encryption SoftwareNot DefinedNot Defined0.000.00044CVE-2023-34140
07/18/20238.88.8Zyxel USG FLEX/VPN Free Time WiFi Hotspot os command injectionNetwork Encryption SoftwareNot DefinedNot Defined0.040.00047CVE-2023-34139
07/18/20238.08.0Zyxel ATP/USG FLEX/VPN os command injectionNetwork Encryption SoftwareNot DefinedNot Defined0.030.00047CVE-2023-34138
07/18/20238.88.8Zyxel ATP/USG FLEX/VPN GRE Configuration os command injectionNetwork Encryption SoftwareNot DefinedNot Defined0.050.00047CVE-2023-33012
07/18/20238.88.8Zyxel ATP/USG FLEX/VPN PPPoE Configuration format stringNetwork Encryption SoftwareNot DefinedNot Defined0.030.00053CVE-2023-33011
07/18/20238.88.8Zyxel ATP/USG FLEX Configuration Parser os command injectionUnknownNot DefinedNot Defined0.040.00053CVE-2023-28767
06/19/20239.89.6ZyXEL NAS326/NAS540 HTTP Request os command injectionUnknownNot DefinedOfficial Fix0.030.02889CVE-2023-27992
06/05/20236.56.3ZyXEL NR7101 HTTP Request buffer overflowUnknownNot DefinedOfficial Fix0.000.00057CVE-2023-27989
05/30/20237.27.0ZyXEL NAS326 os command injectionUnknownNot DefinedOfficial Fix0.000.00050CVE-2023-27988
05/24/20239.89.8Zyxel ATP/USG FLEX/VPN/Zywall ID Processing buffer overflowFirewall SoftwareNot DefinedNot Defined0.060.02137CVE-2023-33010
05/24/20239.89.8Zyxel ATP/USG FLEX/VPN/Zywall Notifications buffer overflowFirewall SoftwareNot DefinedNot Defined0.040.02137CVE-2023-33009
05/02/20234.84.7ZyXEL NBG-418N v2 Web Management Interface cross site scriptingRouter Operating SystemNot DefinedOfficial Fix0.060.00049CVE-2023-22921
05/02/20234.94.8ZyXEL NBG-418N v2 CLI Command buffer overflowRouter Operating SystemNot DefinedOfficial Fix0.000.00065CVE-2023-22924
05/02/20236.56.3ZyXEL NBG-418N v2 format stringRouter Operating SystemNot DefinedOfficial Fix0.050.00065CVE-2023-22923
05/02/20237.57.3ZyXEL NBG-418N v2 Telnet Service buffer overflowRouter Operating SystemNot DefinedOfficial Fix0.000.00081CVE-2023-22922
05/02/20238.88.8ZyXEL NBG-6604 HTTP Request os command injectionRouter Operating SystemNot DefinedNot Defined0.060.00050CVE-2023-22919
04/27/20236.46.3Zyxel DX5401-B0 Export_Log zcmd information disclosureUnknownNot DefinedOfficial Fix0.030.03563CVE-2023-28770
04/27/20239.89.6ZyXEL DX5401-B0 zhttpd libclinkc.so buffer overflowUnknownNot DefinedOfficial Fix0.060.11259CVE-2023-28769
04/25/20239.89.8Zyxel USG/USG FLEX/VPN/ATP Error Message os command injectionNetwork Encryption SoftwareNot DefinedNot Defined0.030.92655CVE-2023-28771
04/24/20233.63.6Zyxel ATP/USG FLEX/VPN Logs Page cross site scriptingNetwork Encryption SoftwareNot DefinedNot Defined0.000.00045CVE-2023-27990
04/24/20235.45.4Zyxel ATP/USG FLEX/VPN CGI Program unknown vulnerabilityNetwork Encryption SoftwareNot DefinedNot Defined0.040.00063CVE-2023-22918

210 more entries are not shown

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