CRITICALCVSS v3.1 9.8Actively exploited · CISA KEV since 2023-06-23Vulnerability

CVE-2023-27992

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.

Properties

Euvd product
NAS542 firmware, NAS540 firmware, NAS326 firmware
Vulnerability name
Zyxel Multiple NAS Devices Command Injection Vulnerability
First seen
2025-10-21T23:05:45+00:00
Cvss score
9.8
Epss score
0.82828
Last seen
2026-10-19T12:00:27+00:00
Due date
2023-07-14
Euvd assigner
Zyxel
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2023-06-23T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2023-06-23
Score
9.8
Euvd base score version
3.1
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Zyxel
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
9.8

Related Entities (9)

AFFECTS_PRODUCT (6)

→[Product]cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Zyxel Multiple NAS Devices Command Injection Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

INVOLVES (1)

←[Signal]kev_added · 2023-06-23

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CVE-2023-27992 (CVSS v3.1 9.8) — Ninja Signal Threat Intelligence | Ninja Signal