CVE-2023-4474

Nas326 Firmware vulnerability

CVSS

9.8

EPSS

29.7%

EPSS pct

98th

Exploited

No known

The improper neutralization of special elements in the WSGI 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.

Affected vendor

Zyxel

Affected product

Nas326 Firmware

CVSS vector

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

Weakness type (CWE)

CWE-78 — OS Command Injection

Published

2023-11-30

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 29.7% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2023-4474

Confirm whether Zyxel Nas326 Firmware is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2023-4474.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2023-4474

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2023-4474 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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