Exploited vulnerability · CISA KEV

Is CVE-2023-27992 exploited? Yes: in CISA KEV since 23 Jun 2023

Gociux · Zyxel Multiple Network-Attached Storage (NAS) Devices · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-27992, Zyxel Multiple NAS Devices Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 23 Jun 2023, 4 days after it was published. It affects Zyxel Multiple Network-Attached Storage (NAS) Devices, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

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.

What to do

1. Check whether you run it. Look for Multiple Network-Attached Storage (NAS) Devices in your asset inventory, including appliances and cloud images. Stack check lists every exploited Zyxel CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 19 Jun 2023.
4. Get told next time. Email alerts when CISA adds a CVE for Zyxel.

Other exploited CVEs in Multiple Network-Attached Storage (NAS) Devices

• CVE-2020-9054: Zyxel Multiple NAS Devices OS Command Injection Vulnerability (25 Mar 2022)

References

• www.zyxel.com/global/en/support/security-advisories/zyxel-security-adviso
• nvd.nist.gov/vuln/detail/CVE-2023-27992

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2023 · Zyxel scorecard · act-now radar.