What’s Vulnerable › Vulnerabilities

CVE-2021-3166

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-18 · updated 2026-06-17
• Weakness: CWE-434

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 products

• 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.md
• https://kaisersource.github.io/dsl-n14u
• https://github.com/kaisersource/kaisersource.github.io/blob/main/_posts/2021-01-17-dsl-n14u.md
• https://kaisersource.github.io/dsl-n14u

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