How severe is CVE-2021-21573?

CVE-2021-21573 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21573 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21573?

CVE-2021-21573 primarily affects Dell Alienware M15 R6 Firmware. In total, 128 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21573?

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-2021-21573 published?

CVE-2021-21573 was published on 2021-06-24 and last updated on 2026-06-17.

CVE-2021-21573

CVE-2021-21573 is a high-severity vulnerability in Dell Alienware M15 R6 Firmware with a CVSS 3.x base score of 7.2. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.9
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Dell Alienware M15 R6 Firmware
Published: 2021-06-24
Last modified: 2026-06-17

Description

Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious admin user with local access to the system may potentially exploit this vulnerability to run arbitrary code and bypass UEFI restrictions.

Frequently asked questions

What is CVE-2021-21573?: Dell BIOSConnect feature contains a buffer overflow vulnerability. An authenticated malicious admin user with local access to the system may potentially exploit this vulnerability to run arbitrary code and bypass UEFI restrictions.
How severe is CVE-2021-21573?: CVE-2021-21573 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21573 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21573?: CVE-2021-21573 primarily affects Dell Alienware M15 R6 Firmware. In total, 128 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21573?: 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-2021-21573 published?: CVE-2021-21573 was published on 2021-06-24 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/en-us/000188682

Affected products (128)

cpe:2.3:o:dell:alienware_m15_r6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:chengming_3990_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:chengming_3991_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g15_5510_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g15_5511_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g3_3500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g5_5500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g7_7500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:g7_7700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_14_5418_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_15_5518_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_15_7510_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3501_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3880_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3881_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_3891_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5301_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5310_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5400_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5400_aio_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5401_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5401_aio_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5402_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5406_2n1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5408_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5409_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5410_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5501_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5502_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5508_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_5509_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7300_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7306_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7500_2-in-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7501_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:dell:inspiron_7506_firmware:*:*:*:*:*:*:*:*

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