Zyxel — known exploited vulnerabilities
The CISA Known Exploited Vulnerabilities catalog (KEV) lists vulnerabilities that CISA has confirmed are being exploited in the wild; U.S. federal civilian agencies are required to remediate each entry by its due date. This page joins the KEV entries for Zyxel with NVD CVSS scores and CISA's ransomware-campaign flag. See our methodology or browse all CVEs.
Key findings
CISA's Known Exploited Vulnerabilities catalog lists 13 Zyxel vulnerabilities confirmed as exploited in the wild across 7 products; 2 of them (15%) are flagged as used in known ransomware campaigns. Multiple Firewalls is the most-affected product, with 5 entries (38% of the total). CISA added 1 entry in 2026 so far, compared with 2 in 2025. Across the 13 entries with an NVD CVSS score (100% of the total), the average score is 9.3; 8 entries are rated critical by NVD. The most recent addition is CVE-2026-7273 (Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability), added on 2026-09-21.
Affected products
| Product | Entries | Share |
|---|---|---|
| Multiple Firewalls | 5 | 38% |
| DSL CPE Devices | 2 | 15% |
| Multiple Network-Attached Storage (NAS) Devices | 2 | 15% |
| GS1900 Series Switches | 1 | 7.7% |
| EMG2926 Routers | 1 | 7.7% |
| P660HN-T1A Routers | 1 | 7.7% |
| Multiple Products | 1 | 7.7% |
Entries added per year
By date added to the KEV catalog
Exploited Zyxel vulnerabilities (13)
Newest first. CVSS scores from NVD where available.
| CVE | Product | Vulnerability | Date added | Ransomware | CVSS |
|---|---|---|---|---|---|
| CVE-2026-7273 | GS1900 Series Switches | Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability | 2026-09-21 | — | HIGH8.8 |
| CVE-2024-40891 | DSL CPE Devices | Zyxel DSL CPE OS Command Injection Vulnerability | 2025-02-11 | — | HIGH8.8 |
| CVE-2024-40890 | DSL CPE Devices | Zyxel DSL CPE OS Command Injection Vulnerability | 2025-02-11 | — | HIGH8.8 |
| CVE-2024-11667 | Multiple Firewalls | Zyxel Multiple Firewalls Path Traversal Vulnerability | 2024-12-03 | Known | HIGH7.5 |
| CVE-2017-6884 | EMG2926 Routers | Zyxel EMG2926 Routers Command Injection Vulnerability | 2023-09-18 | Known | HIGH8.8 |
| CVE-2017-18368 | P660HN-T1A Routers | Zyxel P660HN-T1A Routers Command Injection Vulnerability | 2023-08-07 | — | CRITICAL9.8 |
| CVE-2023-27992 | Multiple Network-Attached Storage (NAS) Devices | Zyxel Multiple NAS Devices Command Injection Vulnerability | 2023-06-23 | — | CRITICAL9.8 |
| CVE-2023-33009 | Multiple Firewalls | Zyxel Multiple Firewalls Buffer Overflow Vulnerability | 2023-06-05 | — | CRITICAL9.8 |
| CVE-2023-33010 | Multiple Firewalls | Zyxel Multiple Firewalls Buffer Overflow Vulnerability | 2023-06-05 | — | CRITICAL9.8 |
| CVE-2023-28771 | Multiple Firewalls | Zyxel Multiple Firewalls OS Command Injection Vulnerability | 2023-05-31 | — | CRITICAL9.8 |
| CVE-2022-30525 | Multiple Firewalls | Zyxel Multiple Firewalls OS Command Injection Vulnerability | 2022-05-16 | — | CRITICAL9.8 |
| CVE-2020-9054 | Multiple Network-Attached Storage (NAS) Devices | Zyxel Multiple NAS Devices OS Command Injection Vulnerability | 2022-03-25 | — | CRITICAL9.8 |
| CVE-2020-29583 | Multiple Products | Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability | 2021-11-03 | — | CRITICAL9.8 |
Source: CISA Known Exploited Vulnerabilities catalog, joined with NIST NVD CVSS data. Vendor names are normalized across spellings. Compare all vendors.