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Critical severity9.8NVD Advisory· Published Mar 28, 2022· Updated Jun 17, 2026

CVE-2022-0342

CVE-2022-0342

Description

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.

Affected products

10
  • Zyxel/VPN seriesllm-fuzzy2 versions
    4.30 - 5.20+ 1 more
    • (no CPE)range: 4.30 - 5.20
    • (no CPE)range: 4.30 through 5.20
  • Zyxel/ZyWALL/USG seriesllm-fuzzy2 versions
    4.20 - 4.70+ 1 more
    • (no CPE)range: 4.20 - 4.70
    • (no CPE)range: 4.20 through 4.70
  • Zyxel/NSG seriesllm-fuzzy
    Range: V1.20 - V1.33 Patch 4
  • Zyxel/ATP seriesllm-fuzzy2 versions
    4.32 - 5.20+ 1 more
    • (no CPE)range: 4.32 - 5.20
    • (no CPE)range: 4.32 through 5.20
  • Zyxel/USG FLEX seriesllm-fuzzy2 versions
    4.50 - 5.20+ 1 more
    • (no CPE)range: 4.50 - 5.20
    • (no CPE)range: 4.50 through 5.20
  • Zyxel/NSG series firmwarev5
    Range: 1.20 through 1.33 Patch 4

Patches

Vulnerability mechanics

References

1

News mentions

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