CVE-2021-3166

Name: CVE-2021-3166
Creator: NVD / NIST
Published: 2021-01-18T05:15:12.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.88%

Last modified Jun 17, 2026

CVE-2021-3166 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered on ASUS DSL-N14U-B1 1.1.2.3_805 devices. An attacker can upload arbitrary file content as a firmware update when the filename Settings_DSL-N14U-B1.trx is used. EPSS estimates a 2.88% chance of exploitation in the next 30 days.

Description

An issue was discovered on ASUS DSL-N14U-B1 1.1.2.3_805 devices. An attacker can upload arbitrary file content as a firmware update when the filename Settings_DSL-N14U-B1.trx is used. Once this file is loaded, shutdown measures on a wide range of services are triggered as if it were a real update, resulting in a persistent outage of those services.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.88%

85.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Asus	Dsl-N14u B1 Firmware	1.1.2.3_805

References

https://github.com/kaisersource/kaisersource.github.io/blob/main/_posts/2021-01-17-dsl-n14u.mdExploit, Third Party Advisory
https://kaisersource.github.io/dsl-n14uExploit, Third Party Advisory
https://github.com/kaisersource/kaisersource.github.io/blob/main/_posts/2021-01-17-dsl-n14u.mdExploit, Third Party Advisory
https://kaisersource.github.io/dsl-n14uExploit, Third Party Advisory

Timeline

Published: Jan 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3166?

How severe is CVE-2021-3166?

CVE-2021-3166 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3166?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3166?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST