How severe is CVE-2021-0156?

CVE-2021-0156 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-0156 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-0156?

CVE-2021-0156 primarily affects Intel Xeon Bronze 3206r Firmware. In total, 680 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-0156?

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-2021-0156 published?

CVE-2021-0156 was published on 2022-02-09 and last updated on 2026-06-17.

CVE-2021-0156

CVE-2021-0156 is a high-severity vulnerability in Intel Xeon Bronze 3206r Firmware with a CVSS 3.x base score of 7.8. 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: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Intel Xeon Bronze 3206r Firmware
Published: 2022-02-09
Last modified: 2026-06-17

Description

Improper input validation in the firmware for some Intel(R) Processors may allow an authenticated user to potentially enable an escalation of privilege via local access.

Frequently asked questions

What is CVE-2021-0156?: Improper input validation in the firmware for some Intel(R) Processors may allow an authenticated user to potentially enable an escalation of privilege via local access.
How severe is CVE-2021-0156?: CVE-2021-0156 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-0156 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-0156?: CVE-2021-0156 primarily affects Intel Xeon Bronze 3206r Firmware. In total, 680 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-0156?: 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-2021-0156 published?: CVE-2021-0156 was published on 2022-02-09 and last updated on 2026-06-17.

References

Affected products (680)

cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
cpe:2.3:o:netapp:fas\/aff_bios:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_bronze_3206r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5218r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5220r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6208u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6226r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6230r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6238r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6240r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6242r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6246r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6248r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6250_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6250l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6256_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6258r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_silver_4210r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_silver_4210t_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_silver_4214r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_silver_4215r_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_platinum_9221_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_platinum_9222_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_bronze_3204_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5215_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5215l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5217_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5218_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5218b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5218n_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5218t_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5220_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5220s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5220t_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_5222_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6209u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6210u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6212u_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6222v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:intel:xeon_gold_6226_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Intel Xeon Bronze 3206r Firmware

CVE-2022-26343 — High (CVSS 8.2): Improper access control in the BIOS firmware for some Intel(R) Processors may allow a privileged user to potentially…
CVE-2021-33123 — High (CVSS 7.8): Improper access control in the BIOS authenticated code module for some Intel(R) Processors may allow a privileged user…
CVE-2021-0189 — High (CVSS 7.8): Use of out-of-range pointer offset in the BIOS firmware for some Intel(R) Processors may allow a privileged user to…
CVE-2021-0159 — High (CVSS 7.8): Improper input validation in the BIOS authenticated code module for some Intel(R) Processors may allow a privileged…
CVE-2021-0117 — High (CVSS 7.8): Pointer issues in the firmware for some Intel(R) Processors may allow a privileged user to potentially enable an…
CVE-2021-0116 — High (CVSS 7.8): Out-of-bounds write in the firmware for some Intel(R) Processors may allow a privileged user to potentially enable an…

All CVEs affecting Intel Xeon Bronze 3206r Firmware →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →