What is CVE-2023-34139?

CVE-2023-34139 is a high-severity vulnerability in Zyxel Usg Flex Series Firmware, classified under OS Command Injection. CVSS score: 8.8/10. Published 2023-07-17.

How severe is CVE-2023-34139?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Zyxel Usg Flex Series Firmware

CVE-2023-34139

A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LA…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.002 (40.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zyxel Usg Flex Series Firmware — versions 4.50 through 5.36 Patch 2
Zyxel Vpn Series Firmware — versions 4.20 through 5.36 Patch 2

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for… (vendor-advisory)

Frequently asked questions

What is CVE-2023-34139?: CVE-2023-34139 is a high-severity vulnerability in Zyxel Usg Flex Series Firmware, classified under OS Command Injection. CVSS score: 8.8/10. Published 2023-07-17.
How severe is CVE-2023-34139?: High severity. CVSS v3 base score is 8.8 out of 10.