How severe is CVE-2021-33155?

CVE-2021-33155 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-33155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33155?

CVE-2021-33155 primarily affects Intel Ax211 Firmware. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33155?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-33155 published?

CVE-2021-33155 was published on 2022-02-09 and last updated on 2026-06-17.

CVE-2021-33155

CVE-2021-33155 is a medium-severity vulnerability in Intel Ax211 Firmware with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 3.x base score 5.7)
CVSS v2: 2.7
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Intel Ax211 Firmware
Published: 2022-02-09
Last modified: 2026-06-17

Description

Improper input validation in firmware for some Intel(R) Wireless Bluetooth(R) and Killer(TM) Bluetooth(R) products before version 22.100 may allow an authenticated user to potentially enable denial of service via adjacent access.

Frequently asked questions

What is CVE-2021-33155?: Improper input validation in firmware for some Intel(R) Wireless Bluetooth(R) and Killer(TM) Bluetooth(R) products before version 22.100 may allow an authenticated user to potentially enable denial of service via adjacent access.
How severe is CVE-2021-33155?: CVE-2021-33155 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-33155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33155?: CVE-2021-33155 primarily affects Intel Ax211 Firmware. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33155?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-33155 published?: CVE-2021-33155 was published on 2022-02-09 and last updated on 2026-06-17.

References

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00604.html

Affected products (16)

cpe:2.3:o:intel:ax211_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ax210_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ax201_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ax200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_9560_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_9462_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_9461_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_9260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_8265_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_8260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac3168_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_7265_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_3165_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ax1675_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ax1650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:intel:ac_1550_firmware:*:*:*:*:*:*:*:*

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