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CVE-2023-33010

Published: May 24, 2023Updated: Oct 27, 2025 Sources: CVE List NVD BDUCWE-120
9.8CRITICAL
NVD MITRE
EPSS Score
28.8%
Top 2.1%
CISA KEV
Active Exploitation
Since Jun 5, 2023
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-120

Affected Products

Zyxel Communications Corp.
commercial·TWaka Zyxel
ATP
Networking Infrastructure
USG FLEX
Networking Infrastructure
USG FLEX 50(W)
Networking Infrastructure
USG USG20(W)-VPN
Networking Infrastructure
VPN
Networking Infrastructure
ZyWALL
Networking Infrastructure
USG
Networking Infrastructure
ATP series firmware
Networking Infrastructure
and 28 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jun 5, 2023
Remediation due:Jun 26, 2023

Required action: Apply updates per vendor instructions.

Official Patch Available
Is your org exposed to CVE-2023-33010?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls
zyxel.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33010
cisa.gov
News mentions
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