Zyxel known exploited vulnerabilities
Every Zyxel CVE on CISA's Known Exploited Vulnerabilities catalog, newest addition first: 13 in all, 1 added in the last 12 months.
- CVE-2026-7273A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow aZyxel GS1900-48HPv2 firmware · Zyxel GS1900-8 firmware +8
- CVE-2024-40891**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the management commands of the legacy DSL CPE Zyxel VZyxel VMG4325-B10A firmware
- CVE-2024-40890**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the CGI program of the legacy DSL CPE Zyxel VMG4325-BZyxel VMG4325-B10A firmware
- CVE-2024-11667A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through V5.38, USG FLEX seriZyxel ATP series firmware · Zyxel USG FLEX series firmwa… +2
- CVE-2017-6884A command injection vulnerability was discovered on the Zyxel EMG2926 home router with firmware V1.00(AAQT.4)b8.
- CVE-2017-18368The ZyXEL P660HN-T1A v1 TCLinux Fw $7.3.15.0 v001 / 3.40(ULM.0)b31 router distributed by TrueOnline has a command injection vulnerability in
- CVE-2023-27992The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versZyxel NAS326 firmware · Zyxel NAS540 firmware +1
- CVE-2023-33010A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX seriZyxel ATP series firmware · Zyxel USG FLEX series firmwa… +4
- CVE-2023-33009A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX serieZyxel ATP series firmware · Zyxel USG FLEX series firmwa… +4
- CVE-2023-28771Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.Zyxel ZyWALL/USG series firmware · Zyxel VPN series firm… +2
- CVE-2022-30525A 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 fZyxel USG FLEX 100(W) firmware · Zyxel USG FLEX 200 firm… +6
- CVE-2020-9054ZyXEL NAS products running firmware version 5.21 and earlier are vulnerable to pre-authentication command injection in weblogin.cgiZyXEL NAS326 · ZyXEL NAS520 +11
- CVE-2020-29583Firmware version 4.60 of Zyxel USG devices contains an undocumented account (zyfwp) with an unchangeable password.
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Frequently asked questions
How many Zyxel vulnerabilities are in CISA KEV?
13 Zyxel vulnerabilities are on CISA's Known Exploited Vulnerabilities catalog, 1 of them added in the last 12 months. The newest is CVE-2026-7273 (Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability), added 2026-09-21.
Which Zyxel products are in CISA KEV?
7 products, including GS1900 Series Switches, DSL CPE Devices, Multiple Firewalls. Attackers have exploited every one of these entries in the wild, and US federal agencies must patch each by its CISA due date.
Are Zyxel KEV vulnerabilities used by ransomware?
CISA knows ransomware campaigns exploit 2 of the 13 Zyxel entries.