How severe is CVE-2021-21571?

CVE-2021-21571 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability high.

Is CVE-2021-21571 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21571?

CVE-2021-21571 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-2021-21571?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21571 published?

CVE-2021-21571 was published on 2021-06-24 and last updated on 2026-06-17.

CVE-2021-21571

CVE-2021-21571 is a medium-severity vulnerability in Dell Alienware M15 R6 Firmware with a CVSS 3.x base score of 5.9. 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-295.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 5.8
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Dell Alienware M15 R6 Firmware
Published: 2021-06-24
Last modified: 2026-06-17

Description

Dell UEFI BIOS https stack leveraged by the Dell BIOSConnect feature and Dell HTTPS Boot feature contains an improper certificate validation vulnerability. A remote unauthenticated attacker may exploit this vulnerability using a person-in-the-middle attack which may lead to a denial of service and payload tampering.

Frequently asked questions

What is CVE-2021-21571?: Dell UEFI BIOS https stack leveraged by the Dell BIOSConnect feature and Dell HTTPS Boot feature contains an improper certificate validation vulnerability. A remote unauthenticated attacker may exploit this vulnerability using a person-in-the-middle attack which may lead to a denial of service and payload tampering.
How severe is CVE-2021-21571?: CVE-2021-21571 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2021-21571 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21571?: CVE-2021-21571 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-2021-21571?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21571 published?: CVE-2021-21571 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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