CRITICALCVSS v3.1 9.8Actively exploited · CISA KEV since 2023-06-05Vulnerability

CVE-2023-33010

Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the ID processing function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.

Properties

Euvd product
USG20(W)-VPN firmware, ATP series firmware, USG FLEX series firmware, USG FLEX 50(W) firmware, VPN series Firmware, ZyWALL/USG series firmware
Vulnerability name
Zyxel Multiple Firewalls Buffer Overflow Vulnerability
First seen
2025-10-21T23:05:47+00:00
Cvss score
9.8
Epss score
0.29024
Last seen
2026-10-19T12:00:27+00:00
Due date
2023-06-26
Euvd assigner
Zyxel
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2023-06-05T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2023-06-05
Score
9.8
Euvd base score version
3.1
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Zyxel
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
9.8

Related Entities (92 · showing 23)

AFFECTS_PRODUCT (89 · showing 20)

→[Product]cpe:2.3:o:zyxel:vpn300_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_40_firmware:4.73:patch1:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_60w_firmware:4.73:patch1:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:usg_40w:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_40_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_40w_firmware:4.73:patch1:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_60_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_40w_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_60_firmware:4.73:patch1:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:usg_40:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_40_firmware:4.73:-:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:usg_60w:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:usg_60:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_40w_firmware:4.73:-:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_60w_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_60w_firmware:4.73:-:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:usg_60_firmware:4.73:-:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:vpn50_firmware:5.36:patch1:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:usg_flex_100w:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:vpn100:-:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Zyxel Multiple Firewalls Buffer Overflow Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

INVOLVES (1)

←[Signal]kev_added · 2023-06-05

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CVE-2023-33010 (CVSS v3.1 9.8) — Ninja Signal Threat Intelligence | Ninja Signal