Zyxel ATP/USG FLEX/USG FLEX 50(W)/USG20(W)-VPN up to 5.38 Packets null pointer dereference

Summaryinfo

A vulnerability was found in Zyxel ATP, USG FLEX, USG FLEX 50(W) and USG20(W)-VPN up to 5.38. It has been rated as problematic. This vulnerability affects unknown code of the component Packets Handler. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2024-42058. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Zyxel ATP, USG FLEX, USG FLEX 50(W) and USG20(W)-VPN up to 5.38 and classified as critical. Affected by this vulnerability is an unknown function of the component Packets Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

A null pointer dereference vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG FLEX 50(W) series firmware versions from V5.20 through V5.38, and USG20(W)-VPN series firmware versions from V5.20 through V5.38 could allow an unauthenticated attacker to cause DoS conditions by sending crafted packets to a vulnerable device.

It is possible to read the advisory at zyxel.com. This vulnerability is known as CVE-2024-42058 since 07/29/2024. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/03/2024).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Network Encryption Software

Vendor

• Zyxel

Name

• ATP
• USG20(W)-VPN
• USG FLEX
• USG FLEX 50(W)

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24
• 5.25
• 5.26
• 5.27
• 5.28
• 5.29
• 5.30
• 5.31
• 5.32
• 5.33
• 5.34
• 5.35
• 5.36
• 5.37
• 5.38

License

• commercial

Website

• Vendor: https://www.zyxel.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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