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CVE-2021-3166

HIGH
7.5
CVSS Score
Published: January 18, 2021 at 04:55 AM UTC
Updated: June 17, 2026 at 04:04 AM UTC
2 products affected across 1 vendorDsl N14U B1 FirmwareDSL-N14U B1

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Severity
HIGH7.5
Exploit prediction
EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dsl N14U B1 Firmware· ASUS
95%
1.1.2.3_805
asus-dsl-n14u-b1 (same device)
DSL-N14U B1· ASUSdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/kaisersource/kaisersource.github.io/blob/main/_posts/2021-01-17-dsl-n14u.md
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://kaisersource.github.io/dsl-n14u

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-434

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