CVE-2022-0342

highpriority · attend · 72EPSS 0.951 · 100 %ileEURUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

95.1% (100th) EPSS

CVSS 7.5 · high

Is it mine?

35 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 through 5.20, and NSG series firmware versions V1.20 through V1.33 Patch 4, which could allow an attacker to bypass the web authentication and obtain administrative access of the device.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · security@zyxel.com.twexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-287US

affected products (35)

Products and version ranges known to be affected.

Zyxel ATP series firmware≤ 4.32 through 5.20enisa_euvdEU
Zyxel NSG series firmware≤ 1.20 through 1.33 Patch 4enisa_euvdEU
Zyxel USG FLEX series firmware≤ 4.50 through 5.20enisa_euvdEU
Zyxel USG/Zywall series Firmware≤ 4.20 through 4.70enisa_euvdEU
Zyxel VPN series Firmware≤ 4.30 through 5.20enisa_euvdEU
Zyxel Communications Corp. ATP4.32 → 5.21fstec_bduRU
Zyxel Communications Corp. NSG1.20 → 1.33p4_WK11fstec_bduRU
Zyxel Communications Corp. USG4.20 → 4.71fstec_bduRU
Zyxel Communications Corp. USG FLEX4.50 → 5.21fstec_bduRU
Zyxel Communications Corp. VPN4.30 → 5.21fstec_bduRU
Zyxel Communications Corp. ZyWALL4.20 → 4.71fstec_bduRU
zyxel atp100 firmware4.32 → 5.20nvdUScpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*
zyxel atp100w firmware4.32 → 5.20nvdUScpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*
zyxel atp200 firmware4.32 → 5.20nvdUScpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*
zyxel atp500 firmware4.32 → 5.20nvdUScpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*
zyxel atp700 firmware4.32 → 5.20nvdUScpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*
zyxel atp800 firmware4.32 → 5.20nvdUScpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*
zyxel nsg300 firmware1.20 → 1.33nvdUScpe:2.3:o:zyxel:nsg300_firmware:*:*:*:*:*:*:*:*
zyxel nsg300 firmware= 1.33nvdUScpe:2.3:o:zyxel:nsg300_firmware:*:*:*:*:*:*:*:*
zyxel usg flex 100 firmware4.50 → 5.20nvdUScpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*

showing 20 of 35

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2022-03-28modified 2026-06-17

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references (5)

External citations — patches, advisories, analysis.

scry

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