Buffer Overflow Vulnerability in Zyxel Firewalls and VPN Products
CVE-2023-33010

9.8CRITICAL

Key Information:

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

Badges

👾 Exploit Exists🦅 CISA Reported

Summary

A vulnerability exists in the ID processing function of multiple Zyxel firewall and VPN firmware versions, which allows unauthenticated attackers to exploit the buffer overflow. Successful exploitation may lead to denial-of-service conditions, compromising system availability, and could also enable remote code execution. This risk emphasizes the importance of promptly updating affected firmware to protect against potential attacks.

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

ATP series firmware 4.32 through 5.36 Patch 1

USG FLEX 50(W) firmware 4.25 through 5.36 Patch 1

USG FLEX series firmware 4.50 through 5.36 Patch 1

References

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

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

.