What is CVE-2022-0823?

CVE-2022-0823 is a medium-severity vulnerability in Zyxel Gs1200-5, classified under Observable Discrepancy. CVSS score: 6.2/10. Published 2022-06-09.

How severe is CVE-2022-0823?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in Zyxel Gs1200-5

CVE-2022-0823

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.

Published 2022-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Zyxel Gs1200-5
Zyxel Gs1200-5 Firmware
Zyxel Gs1200-5hp
Zyxel Gs1200-5hp Firmware
Zyxel Gs1200-8
Zyxel Gs1200-8 Firmware
Zyxel Gs1200-8hp
Zyxel Gs1200-8hp Firmware
Zyxel Gs1200 Series Firmware — versions 2.00 Patch 1

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

www.zyxel.com/support/Zyxel-security-advisory-for-password-guessing-vulnerabili… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2022-0823?: CVE-2022-0823 is a medium-severity vulnerability in Zyxel Gs1200-5, classified under Observable Discrepancy. CVSS score: 6.2/10. Published 2022-06-09.
How severe is CVE-2022-0823?: Medium severity. CVSS v3 base score is 6.2 out of 10.