CVE-2021-3254

Name: CVE-2021-3254
Creator: NVD / NIST
Published: 2022-05-11T12:15:07.95+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.68%

Last modified Jun 17, 2026

CVE-2021-3254 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Asus DSL-N14U-B1 1.1.2.3_805 allows remote attackers to cause a Denial of Service (DoS) via a TCP SYN scan using nmap.. EPSS estimates a 1.68% chance of exploitation in the next 30 days.

Description

Asus DSL-N14U-B1 1.1.2.3_805 allows remote attackers to cause a Denial of Service (DoS) via a TCP SYN scan using nmap.

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

1.68%

74.0th percentile

Probability of exploitation in the next 30 days. Learn more

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/2021-01-22-dsl-n14u.mdBroken Link
https://kaisersource.github.io/dsl-n14u-synExploit, Third Party Advisory
https://github.com/kaisersource/kaisersource.github.io/blob/main/_posts/2021-01-22-dsl-n14u.mdBroken Link
https://kaisersource.github.io/dsl-n14u-synExploit, Third Party Advisory

Timeline

Published: May 11, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3254?

Asus DSL-N14U-B1 1.1.2.3_805 allows remote attackers to cause a Denial of Service (DoS) via a TCP SYN scan using nmap.

How severe is CVE-2021-3254?

CVE-2021-3254 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.68% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3254?

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-2021-3254?

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

Scan your code now

Source: NVD / NIST