Integer Overflow Vulnerability in Zyxel ATP and USG FLEX Series Firmware
CVE-2023-4398

7.5HIGH

Key Information:

Vendor

Zyxel
Status
Atp Series Firmware
Usg Flex Series Firmware
Usg Flex 50(w) Series Firmware
Usg20(w)-vpn Series Firmware
Vendor
CVE Published:
28 November 2023

What is CVE-2023-4398?

An integer overflow vulnerability exists in the QuickSec IPSec toolkit that could allow an unauthenticated attacker to exploit the VPN functionality in impacted Zyxel devices. By sending a specially crafted IKE packet, the attacker may initiate a denial-of-service (DoS) condition, causing affected devices to become unresponsive. This vulnerability affects multiple firmware versions of Zyxel's ATP and USG FLEX series, posing significant security risks if not addressed.

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Affected Version(s)

ATP series firmware versions 4.32 through 5.37

USG FLEX 50(W) series firmware versions 4.16 through 5.37

USG FLEX series firmware versions 4.50 through 5.37

References

https://www.zyxel.com/global/en/support/security-advisori...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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