CVE & CISA-KEV Catalog

CVE-2023-33010

CRITICALCISA KEVEPSS 98th pctl
9.8
CVSS v3
NVD

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.

CWE-120Classic Buffer Overflow

How to fix

Remediation Available
atp100 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
atp100w firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
atp200 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
atp500 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
atp700 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
atp800 firmwareNVD
Affected:>= 4.32, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
usg20-vpn firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
usg 40 firmwareNVD
Affected:>= 4.25, < 4.73Fixed in:4.73CVE-2023-33010derived from NVD
usg 40w firmwareNVD
Affected:>= 4.25, < 4.73Fixed in:4.73CVE-2023-33010derived from NVD
usg 60 firmwareNVD
Affected:>= 4.25, < 4.73Fixed in:4.73CVE-2023-33010derived from NVD
usg 60w firmwareNVD
Affected:>= 4.25, < 4.73Fixed in:4.73CVE-2023-33010derived from NVD
usg flex 100 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
usg flex 200 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
usg flex 500 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
usg flex 50w firmwareNVD
Affected:>= 4.25, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
usg flex 700 firmwareNVD
Affected:>= 4.50, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
vpn1000 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
vpn100 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
vpn300 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD
vpn50 firmwareNVD
Affected:>= 4.30, < 5.36Fixed in:5.36CVE-2023-33010derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

28.81%probability of exploitation in 30 days
98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Zyxel Multiple Firewalls Buffer Overflow Vulnerability

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.

Apply updates per vendor instructions.

Remediation due: 2023-06-26

References

Vendor Advisory1
Government Resource1

Related Vulnerabilities

Other CWE-120 (Classic Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2014-0195Medium6.8100%-Fix
CVE-2017-7269Critical9.8100%KEV-
CVE-2019-11043High8.799%KEV + RansomFix
CVE-2011-4862High10.095%-Fix
CVE-2007-5659High7.894%KEVFix
CVE-2022-3786High7.592%-Fix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-27.