How severe is CVE-2021-36283?

CVE-2021-36283 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36283 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36283?

CVE-2021-36283 primarily affects Dell Chengming 3990 Firmware. In total, 85 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-36283?

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-2021-36283 published?

CVE-2021-36283 was published on 2021-09-28 and last updated on 2026-06-17.

CVE-2021-36283

CVE-2021-36283 is a high-severity vulnerability in Dell Chengming 3990 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. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.2
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Dell Chengming 3990 Firmware
Published: 2021-09-28
Last modified: 2026-06-17

Description

Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM.

Frequently asked questions

What is CVE-2021-36283?: Dell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM.
How severe is CVE-2021-36283?: CVE-2021-36283 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36283 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36283?: CVE-2021-36283 primarily affects Dell Chengming 3990 Firmware. In total, 85 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-36283?: 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-2021-36283 published?: CVE-2021-36283 was published on 2021-09-28 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/000191495/

Affected products (85)

cpe:2.3:o:dell:chengming_3990_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:chengming_3991_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_15_3500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_15_3590_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_15_5500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3493_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3501_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3593_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3793_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3880_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3881_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5400_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5490_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5493_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5498_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5590_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5593_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5598_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7391_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7500_2-in-1_silver_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7501_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7590_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7591_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_3310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_3310_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5300_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5310_2_in_1_firmware:1.4.2:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5401_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5410_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5411_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_5511_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_7200_2_in_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_7210_2_in_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_7220ex_rugged_extreme_tablet_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:latitude_7300_firmware:*:*:*:*:*:*:*:*

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