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CVE-2023-6397

MEDIUMCVSS 5.3/10EPSS 0.30%

Last modified

CVE-2023-6397 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. . EPSS estimates a 0.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
0.30%

21.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ZyxelAtp100 Firmware>= 4.32, < 5.37
ZyxelAtp100 Firmware5.37
ZyxelAtp100w Firmware>= 4.32, < 5.37
ZyxelAtp100w Firmware5.37
ZyxelAtp200 Firmware>= 4.32, < 5.37
ZyxelAtp200 Firmware5.37
ZyxelAtp500 Firmware>= 4.32, < 5.37
ZyxelAtp500 Firmware5.37
ZyxelAtp700 Firmware>= 4.32, < 5.37
ZyxelAtp700 Firmware5.37
ZyxelAtp800 Firmware>= 4.32, < 5.37
ZyxelAtp800 Firmware5.37
ZyxelUsg Flex 100 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 100 Firmware5.37
ZyxelUsg Flex 100ax Firmware>= 4.50, < 5.37
ZyxelUsg Flex 100ax Firmware5.37
ZyxelUsg Flex 100h Firmware>= 4.50, < 5.37
ZyxelUsg Flex 100h Firmware5.37
ZyxelUsg Flex 100w Firmware>= 4.50, < 5.37
ZyxelUsg Flex 100w Firmware5.37
ZyxelUsg Flex 200 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 200 Firmware5.37
ZyxelUsg Flex 200h Firmware>= 4.50, < 5.37
ZyxelUsg Flex 200h Firmware5.37
ZyxelUsg Flex 200hp Firmware>= 4.50, < 5.37
ZyxelUsg Flex 200hp Firmware5.37
ZyxelUsg Flex 50 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 50 Firmware5.37
ZyxelUsg Flex 500 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 500 Firmware5.37
ZyxelUsg Flex 500h Firmware>= 4.50, < 5.37
ZyxelUsg Flex 500h Firmware5.37
ZyxelUsg Flex 50w Firmware>= 4.50, < 5.37
ZyxelUsg Flex 50w Firmware5.37
ZyxelUsg Flex 700 Firmware>= 4.50, < 5.37
ZyxelUsg Flex 700 Firmware5.37
ZyxelUsg Flex 700h Firmware>= 4.50, < 5.37
ZyxelUsg Flex 700h Firmware5.37

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2023-6397?
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.
How severe is CVE-2023-6397?
CVE-2023-6397 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.
How do I fix CVE-2023-6397?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST