CVE-2023-4473 (GCVE-0-2023-4473)

Vulnerability from cvelistv5 – Published: 2023-11-30 01:40 – Updated: 2025-12-16 18:23
VLAI Shadowserver
Summary
A command injection vulnerability in the web server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted URL to a vulnerable device.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Vendor Product Version
Zyxel NAS326 firmware Affected: V5.21(AAZF.14)C0
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Zyxel NAS542 firmware Affected: V5.21(ABAG.11)C0
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zyxel nas326_firmware Affected: 5.21\(aazf.14\)c0
    cpe:2.3:o:zyxel:nas326_firmware:5.21\(aazf.14\)c0:*:*:*:*:*:*:*
 Create a notification for this product.
zyxel nas542_firmware Affected: 5.21\(abag.11\)c0
    cpe:2.3:o:zyxel:nas542_firmware:5.21\(abag.11\)c0:*:*:*:*:*:*:*
 Create a notification for this product.
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0d34558a-d5f9-4c7f-a04a-be50f1a66575

Vulnerability ID: CVE-2023-4473

Status: Confirmed

Status Updated: 2024-04-30 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2024-04-28
Asserted: 2024-04-28
Last Seen: 2024-04-30
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Zyxel / Zyxel NAS326/NAS542 | Class: nas | Severity: Critical (CVSS 9.8) | IoT: yes | In CISA KEV: no | Honeypot connections on 2024-04-30: 333
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class nas
7D Avg 0
Vendor Zyxel
30D Avg 0
90D Avg 0
Product Zyxel NAS326/NAS542
Cisa Kev no
Connections 333
Observation Date 2024-04-30
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 12:29 UTC | Updated: 2026-06-30 12:29 UTC
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      "cveMetadata": "{\"cveId\": \"CVE-2023-4473\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-16T18:23:26.188Z\", \"dateReserved\": \"2023-08-22T06:51:30.982Z\", \"assignerOrgId\": \"96e50032-ad0d-4058-a115-4d2c13821f9f\", \"datePublished\": \"2023-11-30T01:40:09.117Z\", \"assignerShortName\": \"Zyxel\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.