Zyxel USG20(W)-VPN firmware

Name: Zyxel USG20(W)-VPN firmware
Brand: Zyxel

productEU

A product tracked in the threat graph; the vulnerabilities below are known to affect it.

public exploit

by severity

1critical4high2medium0low

updated 2026-10-27

vulnerabilities (8)

Related CVEs.

sort

ID	severity	EPSS	exploitable	patched	published	affected
CVE-2023-33010US	critical9.8OT critical	29.0% (98th)	KEV	no fix	2023-05-24	≤ 4.25 through 5.36 Patch 1
CVE-2023-33009US	—OT critical	28.1% (98th)	KEV	no fix	2023-05-24	≤ 4.60 through 5.36 Patch 1
CVE-2023-27991US	high8.8	1.45% (73rd)	—	no fix	2023-04-24	≤ 4.16 through 5.35
CVE-2023-22915US	high7.5	1.05% (64th)	—	no fix	2023-04-24	≤ 4.30 through 5.35
CVE-2023-22917US	high7.5	0.88% (59th)	—	no fix	2023-04-24	≤ 5.10 through 5.32
CVE-2023-22918US	medium6.5	0.77% (55th)	—	no fix	2023-04-24	≤ 4.16 through 5.35
CVE-2023-22916US	high8.1	0.69% (53rd)	—	no fix	2023-04-24	≤ 5.10 through 5.35
CVE-2023-27990US	medium4.8	0.34% (27th)	—	no fix	2023-04-24	≤ 4.16 through 5.35

The flaw types (CWEs) most of these CVEs share.

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')4 CVEs
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')2 CVEs
CWE-20Improper Input Validation1 CVEs
CWE-359Exposure of Private Personal Information to an Unauthorized Actor1 CVEs
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')1 CVEs

Which sources assert this record, and when.

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