Zyxel Multiple NAS Devices Command Injection Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2023-06-23
• EPSS: 82% chance of exploitation in the next 30 days (higher than 100% of CVEs)
• Critical severity: CVSS 9.8

[ Description ]Official description

The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.

CISA: Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability that could allow an unauthenticated attacker to execute commands remotely via a crafted HTTP request.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 14 Jul 2023): Apply updates per vendor instructions.

• Patch on zyxel.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-aut…PatchVendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource