Which products and versions are affected by CVE-2023-37928?

Affected: NAS326 firmware (Zyxel) versions >= V5.21(AAZF.14)C0; NAS542 firmware (Zyxel) versions >= V5.21(ABAG.11)C0. The full list is in the CVE brief.

Is CVE-2023-37928 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2023-37928 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2023-37928?

No public exploit code is known.

How urgently should CVE-2023-37928 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2023-37928

High

A post-authentication command injection vulnerability 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 authenticated attacker to execute some operating system (OS) commands by sending a crafted…

Published Dec 1, 2023 · Updated Feb 13, 2025

Key Facts

Patch immediately

CVE-2023-37928 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting NAS326 firmware (Zyxel), NAS542 firmware (Zyxel).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 60% probability of exploitation in the next 30 days.
Fixed versions are available, including NAS326 firmware <=5.21\(aazf.14\)c0, NAS542 firmware <=5.21\(abag.11\)c0, NAS326 firmware 5.21\(aazf.14\)c0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

8.8

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

EPSS (30-day exploit likelihood)

60%

Higher than 99.1% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2023-37928 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Affected Products

4 affected entries in total

Product	Affected versions	Fixed in
NAS326 firmwareZyxel	>= V5.21(AAZF.14)C0	5.21\(aazf.14\)c0
NAS542 firmwareZyxel	>= V5.21(ABAG.11)C0	5.21\(abag.11\)c0

Patched Releases

NAS326 firmware

<=5.21\(aazf.14\)c0

NAS542 firmware

<=5.21\(abag.11\)c0

Timeline

Publicly disclosed
Dec 1, 2023
Last updated
Feb 13, 2025

Weakness Type

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

References

FAQ

Common Questions.

A post-authentication command injection vulnerability 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 authenticated attacker to execute some operating system (OS) commands by sending a crafted URL to a vulnerable device.
Affected: NAS326 firmware (Zyxel) versions >= V5.21(AAZF.14)C0; NAS542 firmware (Zyxel) versions >= V5.21(ABAG.11)C0. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including NAS326 firmware <=5.21\(aazf.14\)c0, NAS542 firmware <=5.21\(abag.11\)c0, NAS326 firmware 5.21\(aazf.14\)c0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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