Vulnerability-Lookup

CVE-2023-27992 (GCVE-0-2023-27992)

Vulnerability from cvelistv5 – Published: 2023-06-19 11:42 – Updated: 2025-10-21 23:05

CISA Shadowserver KEVIntel

Summary

The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.

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: active 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

Zyxel

References

2 references

URL	Tags
https://www.zyxel.com/global/en/support/security-…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

3 products

Vendor	Product	Version
Zyxel	NAS326 firmware	Affected: < V5.21(AAZF.14)C0
Zyxel	NAS540 firmware	Affected: < V5.21(AATB.11)C0
Zyxel	NAS542 firmware	Affected: < V5.21(ABAG.11)C0

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 108dc425-827c-490b-bba2-d120469b7466

Vulnerability ID: CVE-2023-27992

Status: Confirmed

Status Updated: 2023-06-23 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2023-06-23

Asserted: 2023-06-23

Scope

Notes: KEV entry: Zyxel Multiple NAS Devices Command Injection Vulnerability | Affected: Zyxel / Multiple Network-Attached Storage (NAS) Devices | Description: 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. | Required action: Apply updates per vendor instructions. | Due date: 2023-07-14 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products; https://nvd.nist.gov/vuln/detail/CVE-2023-27992

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details

Cwes	CWE-78
Feed	CISA Known Exploited Vulnerabilities Catalog
Product	Multiple Network-Attached Storage (NAS) Devices
Due Date	2023-07-14
Date Added	2023-06-23
Vendorproject	Zyxel
Vulnerabilityname	Zyxel Multiple NAS Devices Command Injection Vulnerability
Knownransomwarecampaignuse	Unknown

References

CVE-2023-27992

Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC

Shadowserver

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 6ccdc41a-de53-4375-9535-56bfec0454b6

Vulnerability ID: CVE-2023-27992

Status: Confirmed

Status Updated: 2025-01-23 00:00 UTC

Exploited: Yes

Characteristics

Severity: 98.0

Timestamps

First Seen: 2025-01-07

Asserted: 2025-01-07

Last Seen: 2025-01-23

Scope

Asset Exposure: ['internet-facing']

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/NAS540/NAS542
Cisa Kev	yes
Connections	5
Observation Date	2025-01-23
Vulnerability Class	CVSS
Vulnerability Score	9.8
Vulnerability Severity	Critical

References

Created: 2026-06-30 12:07 UTC | Updated: 2026-06-30 12:07 UTC

KEVIntel

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: fbf57fbc-b12d-4c15-ad06-4bfa9a601548

Vulnerability ID: CVE-2023-27992

Status: Confirmed

Status Updated: 2023-06-23 00:00 UTC

Exploited: Yes

Timestamps

First Seen: 2023-06-23

Asserted: 2023-06-23

Scope

Notes: KEVIntel entry: The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware... | Affected: Zyxel / NAS326 firmware, NAS540 firmware, NAS542 firmware | CVSS: 9.8 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware...
Vendor	Zyxel
Product	NAS326 firmware, NAS540 firmware, NAS542 firmware
Added Date	2023-06-23T00:00:00.000Z
Cvss Score	9.8
Epss Score	None
Cvss Severity	CRITICAL
Epss Percentile	None
Used In Malware	unknown
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	False

References

Created: 2026-06-23 14:05 UTC | Updated: 2026-06-23 14:05 UTC

Show details on NVD website

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}

BDU:2023-03280

Vulnerability from fstec - Published: 20.06.2023

Title

Уязвимость микропрограммного обеспечения сетевых хранилищ Zyxel NAS326, NAS540, NAS542, связанная с непринятием мер по нейтрализации специальных элементов, используемых в команде операционной системы, позволяющая нарушителю выполнить произвольный код

Description

Уязвимость микропрограммного обеспечения сетевых хранилищ Zyxel NAS326, NAS540, NAS542 связана с непринятием мер по нейтрализации специальных элементов, используемых в команде операционной системы. Эксплуатация уязвимости может позволить нарушителю, действующему удалённо, выполнить произвольный код путём отправки специально сформированного HTTP-запроса

Severity


                    
                      AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor

Zyxel Communications Corp.

Software Name

NAS326, NAS540, NAS542

Software Version

до 5.21(AAZF.14)C0 (NAS326), до 5.21(AATB.11)C0 (NAS540), 5.21(ABAG.11)C0 (NAS542)

Possible Mitigations

Установка обновлений из доверенных источников. В связи со сложившейся обстановкой и введенными санкциями против Российской Федерации рекомендуется устанавливать обновления программного обеспечения только после оценки всех сопутствующих рисков. Компенсирующие меры: - использование средств межсетевого экранирования уровня веб-приложений для ограничения удалённого доступа к устройству; - использование виртуальных частных сетей для организации удаленного доступа (VPN); - ограничение доступа к устройству из внешних сетей (Интернет). Использование рекомендаций производителя: https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products

Reference

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products

CWE

CWE-78

JSON

To clipboard

{
  "CVSS 2.0": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
  "CVSS 3.0": "AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "Zyxel Communications Corp.",
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  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "20.06.2023",
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  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "20.06.2023",
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  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "NAS326, NAS540, NAS542",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": null,
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u0438\u043a\u0440\u043e\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449 Zyxel NAS326, NAS540, NAS542, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0430\u044f \u0441 \u043d\u0435\u043f\u0440\u0438\u043d\u044f\u0442\u0438\u0435\u043c \u043c\u0435\u0440 \u043f\u043e \u043d\u0435\u0439\u0442\u0440\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u041d\u0435\u043f\u0440\u0438\u043d\u044f\u0442\u0438\u0435 \u043c\u0435\u0440 \u043f\u043e \u043d\u0435\u0439\u0442\u0440\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b (\u0412\u043d\u0435\u0434\u0440\u0435\u043d\u0438\u0435 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0443 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b) (CWE-78)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u0438\u043a\u0440\u043e\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449 Zyxel NAS326, NAS540, NAS542 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043d\u0435\u043f\u0440\u0438\u043d\u044f\u0442\u0438\u0435\u043c \u043c\u0435\u0440 \u043f\u043e \u043d\u0435\u0439\u0442\u0440\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e, \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u043c\u0443 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e, \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0439 \u043a\u043e\u0434 \u043f\u0443\u0442\u0451\u043c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0441\u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e HTTP-\u0437\u0430\u043f\u0440\u043e\u0441\u0430",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u0418\u043d\u044a\u0435\u043a\u0446\u0438\u044f",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041f\u041e \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e-\u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-78",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 10)\n\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 9,8)"
}

FKIE_CVE-2023-27992

Vulnerability from fkie_nvd - Published: 2023-06-19 12:15 - Updated: 2026-06-17 05:46

CISA Shadowserver KEVIntel

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security@zyxel.com.tw	https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products	Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992	US Government Resource

Impacted products

Vendor	Product	Version
zyxel	nas326_firmware	*
zyxel	nas326	-
zyxel	nas540_firmware	*
zyxel	nas540	-
zyxel	nas542_firmware	*
zyxel	nas542	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "NAS326 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c V5.21(AAZF.14)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "NAS540 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c V5.21(AATB.11)C0"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "NAS542 firmware",
          "vendor": "Zyxel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c V5.21(ABAG.11)C0"
            }
          ]
        }
      ],
      "source": "security@zyxel.com.tw"
    }
  ],
  "cisaActionDue": "2023-07-14",
  "cisaExploitAdd": "2023-06-23",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Zyxel Multiple NAS Devices Command Injection Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A4A72863-E165-4A25-B53F-EE5F97236C5A",
              "versionEndExcluding": "5.21\\(aazf.14\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "E0A01B19-4A91-4FBC-8447-2E854346DAC5",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E86737DF-B02E-484D-AFB8-00D4F3B15330",
              "versionEndExcluding": "5.21\\(aatb.11\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "B2F7264C-D32A-4EE9-BADC-78518D762BCA",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DB6182FF-5301-474F-B324-651208839B0F",
              "versionEndExcluding": "5.21\\(abag.11\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "31C4DD0F-28D0-4BF7-897B-5EEC32AA7277",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to\u00a0V5.21(AAZF.14)C0, NAS540 firmware versions prior to\u00a0V5.21(AATB.11)C0, and NAS542\u00a0firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request."
    }
  ],
  "id": "CVE-2023-27992",
  "lastModified": "2026-06-17T05:46:20.047",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security@zyxel.com.tw",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-27992",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-01-27T22:16:42.703923Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-06-19T12:15:09.433",
  "references": [
    {
      "source": "security@zyxel.com.tw",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992"
    }
  ],
  "sourceIdentifier": "security@zyxel.com.tw",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "security@zyxel.com.tw",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-5WV9-H9HR-4P52

Vulnerability from github – Published: 2023-06-19 12:30 – Updated: 2025-10-22 00:32

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2023-27992"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-19T12:15:09Z",
    "severity": "CRITICAL"
  },
  "details": "The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to\u00a0V5.21(AAZF.14)C0, NAS540 firmware versions prior to\u00a0V5.21(AATB.11)C0, and NAS542\u00a0firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.",
  "id": "GHSA-5wv9-h9hr-4p52",
  "modified": "2025-10-22T00:32:44Z",
  "published": "2023-06-19T12:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27992"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992"
    },
    {
      "type": "WEB",
      "url": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2023-27992

Vulnerability from gsd - Updated: 2023-12-13 01:20

Details

Aliases

CVE-2023-27992

Aliases

CVE-2023-27992

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2023-27992",
    "id": "GSD-2023-27992"
  },
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      "exploitCode": "unknown",
      "remediation": "unknown",
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      "id": "GSD-2023-27992",
      "modified": "2023-12-13T01:20:55.522547Z",
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      "lastModifiedDate": "2023-06-27T12:49Z",
      "publishedDate": "2023-06-19T12:15Z"
    }
  }
}

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.

Action not permitted

CVE-2023-27992 (GCVE-0-2023-27992)

CISA

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Vendor Report Successful Exploitation Confidence: 80% Source: cisa-kev

Details

References

Shadowserver

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Characteristics

Timestamps

Scope

Evidence

Honeypot In The Wild Attempts Confidence: 70% Source: shadowserver

Details

References

KEVIntel

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

BDU:2023-03280

FKIE_CVE-2023-27992

GHSA-5WV9-H9HR-4P52

GSD-2023-27992

Tags

Sightings

Nomenclature