An improper control of interaction frequency vulnerability in Zyxel GS1200 series switches could allow a local attacker to guess the passwo…

published 2022-06-07 4y ago modified 2026-06-17 4mo ago also EUVD-2022-15871

cvss: 6.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits: 0; none known

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.

Patch / fix

fixed in 4 links 1

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\(abmf.1\)

zyxel.com/support/Zyxel-security-advisory-for-password-guessing-vuln… advisory

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Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.2	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	6.2	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

Zyxel Zyxel GS1200 series firmware

Classification

Weakness

CWE-203 Observable Discrepancy

References

zyxel.com /support/Zyxel-security-advisory-for-password-guessing-vulnerability-of-GS1200-series-switches.shtml
patch, vendor-advisory

Sources

CVE List CVE-2022-0823
NVD CVE-2022-0823

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