RCE in Zyxel Nas326
CVE-2020-9054
Multiple ZyXEL network-attached storage (NAS) devices running firmware version 5.21 contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable…
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.943 (99.9th percentile) — read the EPSS interpretation.
Affected products
- Zyxel Nas326 — versions V5.21(AAZF.7)C0
- Zyxel Nas520 — versions V5.21(AASZ.3)C0
- Zyxel Nas540 — versions V5.21(AATB.4)C0
- Zyxel Nas542 — versions V5.21(ABAG.4)C0
- Zyxel Nsa210 — versions all
- Zyxel Nsa220 — versions all
- Zyxel Nsa220+ — versions all
- Zyxel Nsa221 — versions all
- Zyxel Nsa310 — versions V4.75(AALH.2)C0
- Zyxel Nsa320 — versions all
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- cwe.mitre.org/data/definitions/78.html (x_refsource_MISC)
- www.zyxel.com/support/remote-code-execution-vulnerability-of-NAS-products.shtml (x_refsource_CONFIRM)
- VU#498544 (third-party-advisory, x_refsource_CERT-VN)
- kb.cert.org/artifacts/cve-2020-9054.html (x_refsource_MISC)
- krebsonsecurity.com/2020/02/zyxel-fixes-0day-in-network-storage-devices/ (x_refsource_MISC)
Frequently asked questions
- What is CVE-2020-9054?
- CVE-2020-9054 is a vulnerability in Zyxel Nas326, classified under OS Command Injection. Published 2020-03-04.
- Is CVE-2020-9054 known to be exploited?
- Yes. CVE-2020-9054 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.