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.

Published: 2022-02-09 Last update: 2025-05-05 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-33155 is rated Low Risk (32.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-33155

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-06-25 0.16% 0.10% -0.06%
2 2025-06-05 0.07% 0.16% +0.10%
3 2025-03-17 — 0.07% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-33155

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.7 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.1 3.6 [email protected]
5.7 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.1 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
2.7 2.0 LOW
AV:A/AC:L/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 5.1 2.9 [email protected]

Weakness enumeration for CVE-2021-33155

OS Trackers for CVE-2021-33155

vendor priority summary link
suse medium CVE-2021-33155 severity moderate: SUSE including 472 source package names (kernel-firmware, kernel-firmware-20170530-21.34.1, …), 728 product×package rows across 62 product lines (Container rancher/elemental-teal-rt/5.3, Container rancher/elemental-teal-rt/5.4, … (62 product lines)): Fixed 726, Known Not Affected 2. https://www.suse.com/security/cve/CVE-2021-33155/
ubuntu medium CVE-2021-33155 medium priority: Ubuntu including 1 source packages (linux-firmware), 14 status rows across 14 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 8, ignored 6. https://ubuntu.com/security/CVE-2021-33155

Affected software / configurations for CVE-2021-33155

Vendor Product Version Raw CPE
intel ax211_firmware < 22.100 cpe:2.3:o:intel:ax211_firmware:*:*:*:*:*:*:*:*
intel ax210_firmware < 22.100 cpe:2.3:o:intel:ax210_firmware:*:*:*:*:*:*:*:*
intel ax201_firmware < 22.100 cpe:2.3:o:intel:ax201_firmware:*:*:*:*:*:*:*:*
intel ax200_firmware < 22.100 cpe:2.3:o:intel:ax200_firmware:*:*:*:*:*:*:*:*
intel ac_9560_firmware < 22.100 cpe:2.3:o:intel:ac_9560_firmware:*:*:*:*:*:*:*:*
intel ac_9462_firmware < 22.100 cpe:2.3:o:intel:ac_9462_firmware:*:*:*:*:*:*:*:*
intel ac_9461_firmware < 22.100 cpe:2.3:o:intel:ac_9461_firmware:*:*:*:*:*:*:*:*
intel ac_9260_firmware < 22.100 cpe:2.3:o:intel:ac_9260_firmware:*:*:*:*:*:*:*:*
intel ac_8265_firmware < 22.100 cpe:2.3:o:intel:ac_8265_firmware:*:*:*:*:*:*:*:*
intel ac_8260_firmware < 22.100 cpe:2.3:o:intel:ac_8260_firmware:*:*:*:*:*:*:*:*
intel ac3168_firmware < 22.100 cpe:2.3:o:intel:ac3168_firmware:*:*:*:*:*:*:*:*
intel ac_7265_firmware < 22.100 cpe:2.3:o:intel:ac_7265_firmware:*:*:*:*:*:*:*:*
intel ac_3165_firmware < 22.100 cpe:2.3:o:intel:ac_3165_firmware:*:*:*:*:*:*:*:*
intel ax1675_firmware < 22.100 cpe:2.3:o:intel:ax1675_firmware:*:*:*:*:*:*:*:*
intel ax1650_firmware < 22.100 cpe:2.3:o:intel:ax1650_firmware:*:*:*:*:*:*:*:*
intel ac_1550_firmware < 22.100 cpe:2.3:o:intel:ac_1550_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-33155

cvelogic Threat Intelligence