VulnerabilityModified

CVE-2021-4029

A command injection vulnerability in the CGI program of the Zyxel ARMOR Z1/Z2 firmware could allow an attacker to execute arbitrary OS commands via a LAN interface.

HIGH 8.8EPSS 0.75%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A command injection vulnerability in the CGI program of the Zyxel ARMOR Z1/Z2 firmware could allow an attacker to execute arbitrary OS commands via a LAN interface.

CVSS 3.1: 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.75% probability · 53th percentile
CISA KEV: Not listed
Weakness: CWE-78
Affected: zyxel/nbg6816 firmware · zyxel/nbg6817 firmware
Source: security@zyxel.com.tw

References

https://www.zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtmlVendor Advisory
https://www.zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtmlVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.