What’s Vulnerable › Vulnerabilities

CVE-2022-0823

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-09 · updated 2026-06-17
• Weakness: CWE-203

Description

An improper control of interaction frequency vulnerability in Zyxel GS1200 series switches could allow a local attacker to guess the password by using a timing side-channel attack.

Affected products

• Zyxel Gs1200-5 Firmware: before 2.00\(abkm.1\) — fixed in 2.00\(abkm.1\)
• Zyxel Gs1200-5Hp Firmware: before 2.00\(abkn.1\) — fixed in 2.00\(abkn.1\)
• Zyxel Gs1200-8 Firmware: before 2.00\(abme.1\) — fixed in 2.00\(abme.1\)
• Zyxel Gs1200-8Hp Firmware: before 2.00\(abmf.1\) — fixed in 2.00\(abmf.1\)

How to fix

Upgrade to a fixed version: Zyxel Gs1200-5 Firmware 2.00\(abkm.1\); Zyxel Gs1200-5Hp Firmware 2.00\(abkn.1\); Zyxel Gs1200-8 Firmware 2.00\(abme.1\); Zyxel Gs1200-8Hp Firmware 2.00\(abmf.1\). Check the vendor advisory for mitigations.

References

• https://www.zyxel.com/support/Zyxel-security-advisory-for-password-guessing-vulnerability-of-GS1200-series-switches.shtml
• https://www.zyxel.com/support/Zyxel-security-advisory-for-password-guessing-vulnerability-of-GS1200-series-switches.shtml

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