All vulnerabilities
CVE-2020-9054

Zyxel Multiple NAS Devices OS Command Injection Vulnerability

Zyxel Multiple Network-Attached Storage (NAS) DevicesNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationExploited in the wildAdded to KEV 25 Mar 2022CISA KEV
Exploit odds (EPSS)>99.9%Chance of exploitation activity in the next 30 days, higher than 99.9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline15 Apr 2022Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 4 Mar 2020, 19:30 UTCPublishedCVE List
  2. 25 Mar 2022Added to CISA KEVCISA KEV

Public exploit code and templates 1

  • Scanner templateZyxel NAS Firmware 5.21- Remote Code ExecutionNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

Multiple Zyxel network-attached storage (NAS) devices contain a pre-authentication command injection vulnerability, which may allow a remote, unauthenticated attacker to execute arbitrary code.

Text from CVE List

Affected versions 13

  • NAS326affected: V5.21(AAZF.7)C0 through V5.21(AAZF.7)C0CVE List
  • NAS520affected: V5.21(AASZ.3)C0 through V5.21(AASZ.3)C0CVE List
  • NAS540affected: V5.21(AATB.4)C0 through V5.21(AATB.4)C0CVE List
  • NAS542affected: V5.21(ABAG.4)C0 through V5.21(ABAG.4)C0CVE List
  • NSA210affected: allCVE List
  • NSA220affected: allCVE List
  • NSA220+affected: allCVE List
  • NSA221affected: allCVE List
  • NSA310affected: V4.75(AALH.2)C0 through V4.75(AALH.2)C0CVE List
  • NSA320affected: allCVE List
  • NSA320Saffected: V4.75(AANV.2)C0 through V4.75(AANV.2)C0CVE List
  • NSA325affected: V4.81(AAAJ.1)C0 through V4.81(AAAJ.1)C0CVE List
  • NSA325v2affected: V4.81(AALS.1)C0 through V4.81(AALS.1)C0CVE List

References 7