PatchSiren

PatchSiren cyber security CVE debrief

CVE-2023-27992 Zyxel CVE debrief

CVE-2023-27992 is a Zyxel command-injection vulnerability affecting multiple NAS devices. CISA added it to the Known Exploited Vulnerabilities catalog on 2023-06-23 and set a remediation due date of 2023-07-14. Organizations should treat affected Zyxel NAS appliances as urgent patching candidates, especially where they store backups or other sensitive data.

Vendor
Zyxel
Product
Multiple Network-Attached Storage (NAS) Devices
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-06-23
Original CVE updated
2023-06-23
Advisory published
2023-06-23
Advisory updated
2023-06-23

Who should care

Security, infrastructure, and vulnerability management teams responsible for Zyxel NAS appliances; incident responders; and any organization that uses these devices to store files, backups, or other sensitive information.

Technical summary

The supplied authoritative source is CISA's KEV entry, which identifies CVE-2023-27992 as a command-injection issue in Zyxel multiple NAS devices. The KEV notes reference Zyxel's security advisory for a pre-authentication command-injection vulnerability in NAS products and direct defenders to apply updates per vendor instructions. Because the flaw is listed in CISA KEV, remediation should be prioritized against the 2023-07-14 due date supplied in the corpus.

Defensive priority

Urgent

Recommended defensive actions

  • Apply Zyxel updates and follow the vendor's remediation instructions as soon as possible.
  • Inventory Zyxel NAS devices and confirm whether any affected systems are still in service.
  • Prioritize any exposed or internet-reachable NAS appliances for immediate remediation.
  • Temporarily isolate affected devices or restrict access if patching must be delayed.
  • Review logs and alerts for unexpected command execution, configuration changes, or other unusual NAS activity.

Evidence notes

This debrief is based only on the supplied CISA KEV record and the official links named in the corpus. The corpus confirms the vulnerability type as command injection, includes a vendor-advisory reference describing it as pre-authentication command injection in NAS products, and provides the KEV due date. No CVSS score was supplied in the source corpus.

Official resources

CVE and KEV timing in the supplied corpus is 2023-06-23, with the CISA KEV remediation due date set to 2023-07-14. This debrief uses those supplied dates and does not infer a later issue date.