CVE-2021-33126

Improper access control in the firmware for some Intel(R) 700 and 722 Series Ethernet Controllers and Adapters before versions 8.5 and 1.5.5 may allow a privileged user to potentially enable denial of service via local access.

Published: 2022-08-18 Last update: 2025-05-05 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-33126 is rated Low Risk (20.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.19%). 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-2021-33126

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 2026-06-15 0.05% 0.19% +0.14%
2 2025-11-23 0.04% 0.05% +0.01%
3 2023-03-07 — 0.04% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-33126

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.4 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:H)
They need powerful rights—admin, root, or similar—before this pays off.
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.
 0.8 3.6 [email protected]
4.4 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:H)
They need powerful rights—admin, root, or similar—before this pays off.
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.
 0.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2021-33126

Affected software / configurations for CVE-2021-33126

Vendor Product Version Raw CPE
intel ethernet_controller_xxv710_firmware < 8.5 cpe:2.3:o:intel:ethernet_controller_xxv710_firmware:*:*:*:*:*:*:*:*
intel ethernet_controller_xl710_firmware < 8.5 cpe:2.3:o:intel:ethernet_controller_xl710_firmware:*:*:*:*:*:*:*:*
intel ethernet_controller_v710_firmware < 8.5 cpe:2.3:o:intel:ethernet_controller_v710_firmware:*:*:*:*:*:*:*:*
intel ethernet_controller_x710_firmware < 8.5 cpe:2.3:o:intel:ethernet_controller_x710_firmware:*:*:*:*:*:*:*:*
intel ethernet_network_adapter_x722da2_firmware < 1.5.5 cpe:2.3:o:intel:ethernet_network_adapter_x722da2_firmware:*:*:*:*:*:*:*:*
intel ethernet_network_adapter_x722da4fh_firmware < 1.5.5 cpe:2.3:o:intel:ethernet_network_adapter_x722da4fh_firmware:*:*:*:*:*:*:*:*
intel ethernet_network_adapter_x722da4g1p5_firmware < 1.5.5 cpe:2.3:o:intel:ethernet_network_adapter_x722da4g1p5_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-33126

cvelogic Threat Intelligence