Vendor dossier / #22
Zyxel vulnerabilities in CISA KEV
Answer CISA's KEV catalog lists 13 Zyxel vulnerabilities as of catalog 2026.09.23, 0.8% of all 1,721 entries and rank 22 of 283 vendors. The first was added on 2021-11-03 and the most recent on 2026-09-21; 2 are flagged as used in ransomware campaigns.
- KEV entries
- 130.8% of catalog
- Last 90 days
- +1added
- Ransomware: known
- 215.4%
- Products
- 7distinct
- First added
- 2021-11-03
- Latest added
- 2026-09-21
- Median days to due
- 21
- Open deadlines
- 1federal
TAdditions per quarter
Table view (by year)
| Year | Added |
|---|---|
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 6 |
| 2024 | 1 |
| 2025 | 2 |
| 2026 | 1 |
QCommon questions
How many Zyxel vulnerabilities are in CISA KEV?
13, as of KEV catalog 2026.09.23 (released 2026-09-23). That is 0.8% of the catalog.
Which Zyxel product has the most KEV entries?
Multiple Firewalls, with 5 entries. 7 products appear in total.
How many Zyxel KEV vulnerabilities are linked to ransomware?
2 of 13 (15.4%) are flagged by CISA as known to be used in ransomware campaigns.
When was the latest Zyxel vulnerability added to KEV?
2026-09-21 (CVE-2026-7273).
What is the most common weakness in Zyxel KEV entries?
CWE-78 (OS command injection), listed on 8 entries.
PProducts
| Product | Entries | Share of vendor |
|---|---|---|
| Multiple Firewalls | 5 | 38.5% |
| DSL CPE Devices | 2 | 15.4% |
| Multiple Network-Attached Storage (NAS) Devices | 2 | 15.4% |
| GS1900 Series Switches | 1 | 7.7% |
| EMG2926 Routers | 1 | 7.7% |
| P660HN-T1A Routers | 1 | 7.7% |
| Multiple Products | 1 | 7.7% |
WWeaknesses
| CWE | Entries | Share of vendor |
|---|---|---|
| CWE-78 OS command injection | 8 | 61.5% |
| CWE-120 Classic buffer overflow | 2 | 15.4% |
| CWE-121 Stack-based buffer overflow | 1 | 7.7% |
| CWE-22 Path traversal | 1 | 7.7% |
| CWE-522 | 1 | 7.7% |
EAll 13 entries
| CVE | Product | Vulnerability | Added | Due | Ransomware | CWE |
|---|---|---|---|---|---|---|
| CVE-2026-7273 | GS1900 Series Switches | Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability | New | Open | Unknown | CWE-121 |
| CVE-2024-40891 | DSL CPE Devices | Zyxel DSL CPE OS Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2024-40890 | DSL CPE Devices | Zyxel DSL CPE OS Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2024-11667 | Multiple Firewalls | Zyxel Multiple Firewalls Path Traversal Vulnerability | Known | CWE-22 | ||
| CVE-2017-6884 | EMG2926 Routers | Zyxel EMG2926 Routers Command Injection Vulnerability | Known | CWE-78 | ||
| CVE-2017-18368 | P660HN-T1A Routers | Zyxel P660HN-T1A Routers Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2023-27992 | Multiple Network-Attached Storage (NAS) Devices | Zyxel Multiple NAS Devices Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2023-33010 | Multiple Firewalls | Zyxel Multiple Firewalls Buffer Overflow Vulnerability | Unknown | CWE-120 | ||
| CVE-2023-33009 | Multiple Firewalls | Zyxel Multiple Firewalls Buffer Overflow Vulnerability | Unknown | CWE-120 | ||
| CVE-2023-28771 | Multiple Firewalls | Zyxel Multiple Firewalls OS Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2022-30525 | Multiple Firewalls | Zyxel Multiple Firewalls OS Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2020-9054 | Multiple Network-Attached Storage (NAS) Devices | Zyxel Multiple NAS Devices OS Command Injection Vulnerability | Unknown | CWE-78 | ||
| CVE-2020-29583 | Multiple Products | Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability | Unknown | CWE-522 |
Cite this
CISA's Known Exploited Vulnerabilities catalog lists 13 Zyxel vulnerabilities (0.8% of all entries). Source: Telemetry analysis of the CISA Known Exploited Vulnerabilities catalog, version 2026.09.23 (released 2026-09-23). https://glide-telemetry.pages.dev/vendors/zyxel/
Source: CISA KEV catalog v2026.09.23, released 2026-09-23. Windows end 2026-09-23. Vendor names are CISA's vendorProject strings; Telemetry states no facts about Zyxel beyond this data.