CVE & CISA-KEV Catalog

CVE-2023-6397

MEDIUM
6.5
CVSS v3
NVD

Description

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available
atp100 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
atp100w firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
atp200 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
atp500 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
atp700 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
atp800 firmwareNVD
Affected:>= 4.32, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 100 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 100ax firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 100h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 100w firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 200 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 200h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 200hp firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 500 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 500h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 50 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 50w firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 700 firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD
usg flex 700h firmwareNVD
Affected:>= 4.50, < 5.37Fixed in:5.37CVE-2023-6397derived from NVD

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 VectorAdjacent
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

0.30%probability of exploitation in 30 days
22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-21758High7.592%-Fix
CVE-2023-21547High7.588%-Fix
CVE-2014-3470Medium4.386%-Fix
CVE-2021-44224High8.282%-Fix
CVE-2016-0742High7.582%-Fix
CVE-2009-1386Medium5.080%-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 2025-01-21.