How severe is CVE-2021-3229?

CVE-2021-3229 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-2021-3229 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3229?

CVE-2021-3229 affects Asus Rt-ax3000 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3229?

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-2021-3229 published?

CVE-2021-3229 was published on 2021-02-05 and last updated on 2026-06-17.

CVE-2021-3229

CVE-2021-3229 is a high-severity vulnerability in Asus Rt-ax3000 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: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Asus Rt-ax3000 Firmware
Published: 2021-02-05
Last modified: 2026-06-17

Description

Denial of service in ASUSWRT ASUS RT-AX3000 firmware versions 3.0.0.4.384_10177 and earlier versions allows an attacker to disrupt the use of device setup services via continuous login error.

Frequently asked questions

What is CVE-2021-3229?: Denial of service in ASUSWRT ASUS RT-AX3000 firmware versions 3.0.0.4.384_10177 and earlier versions allows an attacker to disrupt the use of device setup services via continuous login error.
How severe is CVE-2021-3229?: CVE-2021-3229 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-2021-3229 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3229?: CVE-2021-3229 affects Asus Rt-ax3000 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3229?: 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-2021-3229 published?: CVE-2021-3229 was published on 2021-02-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:asus:rt-ax3000_firmware:*:*:*:*:*:*:*:*

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