How severe is CVE-2021-3254?

CVE-2021-3254 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-3254 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3254?

CVE-2021-3254 affects Asus Dsl-n14u-b1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3254?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3254 published?

CVE-2021-3254 was published on 2022-05-11 and last updated on 2026-06-17.

CVE-2021-3254

CVE-2021-3254 is a high-severity vulnerability in Asus Dsl-n14u-b1 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Asus Dsl-n14u-b1 Firmware
Published: 2022-05-11
Last modified: 2026-06-17

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.

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 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-3254 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3254?: CVE-2021-3254 affects Asus Dsl-n14u-b1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3254?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3254 published?: CVE-2021-3254 was published on 2022-05-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:asus:dsl-n14u-b1_firmware:1.1.2.3_805:*:*:*:*:*:*:*

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