CVE-2024-42057

HIGH EXPLOITED RANSOMWARE

Zyxel ATP/USG FLEX/USG20-W VPN 4.32-5.38 - Unauthenticated OS Command Injection via Long Username

Title source: llm

Exploitation Summary

CVE-2024-42057 has been observed exploited in the wild (reported by VulnCheck KEV), including in ransomware campaigns.

Description

A command injection vulnerability in the IPSec VPN feature of 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 V4.16 through V5.38, and USG20(W)-VPN series firmware versions from V4.16 through V5.38 could allow an unauthenticated attacker to execute some OS commands on an affected device by sending a crafted username to the vulnerable device. Note that this attack could be successful only if the device was configured in User-Based-PSK authentication mode and a valid user with a long username exceeding 28 characters exists.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-09-03-2024

Scores

CVSS v3 8.1

EPSS 0.0288

EPSS Percentile 86.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

VulnCheck KEV 2024-11-25

Ransomware Use Confirmed

CWE

CWE-78

Status published

Products (1)

zyxel/zld 4.32 - 5.39

Published Sep 03, 2024

Tracked Since Feb 18, 2026