VULNERABILITY INTELLIGENCE

CVE-2023-33009

CVSS score9.8 CRITICAL
EPSS probability28.14%
CISA KEVKnown exploited vulnerability
Published2023-05-24
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Known Exploited Vulnerability

Zyxel Multiple Firewalls Buffer Overflow Vulnerability

Vendor / product: Zyxel / Multiple Firewalls

Description

A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.

Weakness classification

  • security@zyxel.com.tw: CWE-120
  • nvd@nist.gov: CWE-120

Primary references