CVE-2023-6397

Home/CVE/A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FL

CVE

A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FL

A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1 could allow a LAN-based attacker to cause denial-of-service (DoS) conditions by downloading a crafted RAR compressed file onto a LAN-side host if the firewall has the “Anti-Malware” feature enabled.

MEDIUM · CVSS 6.5 EPSS 0.00129

Monitor

No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence

Sigma rules0 YARA rules0

⬡

Weakness Classification

CWE-476NULL Pointer Dereference

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Affected Products & Versions

zyxel atp100 firmware>= 4.32 and < 5.37
zyxel atp100 firmwareall versions
zyxel atp100w firmware>= 4.32 and < 5.37
zyxel atp100w firmwareall versions
zyxel atp200 firmware>= 4.32 and < 5.37
zyxel atp200 firmwareall versions
zyxel atp500 firmware>= 4.32 and < 5.37
zyxel atp500 firmwareall versions
Show all 38 affected productszyxel atp700 firmware>= 4.32 and < 5.37
zyxel atp700 firmwareall versions
zyxel atp800 firmware>= 4.32 and < 5.37
zyxel atp800 firmwareall versions
zyxel usg flex 100 firmware>= 4.50 and < 5.37
zyxel usg flex 100 firmwareall versions
zyxel usg flex 100ax firmware>= 4.50 and < 5.37
zyxel usg flex 100ax firmwareall versions
zyxel usg flex 100h firmware>= 4.50 and < 5.37
zyxel usg flex 100h firmwareall versions
zyxel usg flex 100w firmware>= 4.50 and < 5.37
zyxel usg flex 100w firmwareall versions
zyxel usg flex 200 firmware>= 4.50 and < 5.37
zyxel usg flex 200 firmwareall versions
zyxel usg flex 200h firmware>= 4.50 and < 5.37
zyxel usg flex 200h firmwareall versions
zyxel usg flex 200hp firmware>= 4.50 and < 5.37
zyxel usg flex 200hp firmwareall versions
zyxel usg flex 50 firmware>= 4.50 and < 5.37
zyxel usg flex 50 firmwareall versions
zyxel usg flex 500 firmware>= 4.50 and < 5.37
zyxel usg flex 500 firmwareall versions
zyxel usg flex 500h firmware>= 4.50 and < 5.37
zyxel usg flex 500h firmwareall versions
zyxel usg flex 50w firmware>= 4.50 and < 5.37
zyxel usg flex 50w firmwareall versions
zyxel usg flex 700 firmware>= 4.50 and < 5.37
zyxel usg flex 700 firmwareall versions
zyxel usg flex 700h firmware>= 4.50 and < 5.37
zyxel usg flex 700h firmwareall versions

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Scoring & Timeline

6.5

MEDIUM · CVSS v3.1 · security@zyxel.com.tw

View on NVD

Attack Vector

Network Adjacent Local Physical

Attack Complexity

Low High

Privileges Required

None Low High

User Interaction

None Required

Scope

Unchanged Changed

Confidentiality

None Low High

Integrity

None Low High

Availability

None Low High

Published to NVD20 Feb 2024 · 02:15 AM

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

SSVC triage · cisa-vulnrichment

Exploitation

none

Automatable

Technical impact

partial

SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.

🔗

References & Sources

Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024Vendor Advisory

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