CVE-2021-21571

MEDIUM

6.5

CVSS Score

Published: June 24, 2021 at 05:00 PM UTC

Updated: June 17, 2026 at 03:35 AM UTC

257 products affected across 1 vendorLatitude 9410 FirmwareLatitude 5411 FirmwareLatitude 5511 Firmware

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Alienware M15 R6 Firmware · Dell

95%

v < 1.3.3

Affected range stops below 1.3.3, so it looks safe — our inference, not a vendor statement

Chengming 3990 Firmware · Dell

95%

v < 1.4.1

Affected range stops below 1.4.1, so it looks safe — our inference, not a vendor statement

dell-chengming-3990 (same device)

Chengming 3991 Firmware · Dell

95%

v < 1.4.1

Affected range stops below 1.4.1, so it looks safe — our inference, not a vendor statement

G15 5510 Firmware · Dell

95%

v < 1.4.0

Affected range stops below 1.4.0, so it looks safe — our inference, not a vendor statement

dell-g15-5510 (same device)

G15 5511 Firmware · Dell

95%

v < 1.3.3

Affected range stops below 1.3.3, so it looks safe — our inference, not a vendor statement

G3 3500 Firmware · Dell

95%

v < 1.9.0

Affected range stops below 1.9.0, so it looks safe — our inference, not a vendor statement

G5 5500 Firmware · Dell

95%

v < 1.9.0

Affected range stops below 1.9.0, so it looks safe — our inference, not a vendor statement

G7 7500 Firmware · Dell

95%

v < 1.9.0

Affected range stops below 1.9.0, so it looks safe — our inference, not a vendor statement

G7 7700 Firmware · Dell

95%

v < 1.9.0

Affected range stops below 1.9.0, so it looks safe — our inference, not a vendor statement

Inspiron 14 5418 Firmware · Dell

95%

v < 2.1.0_a06

Affected range stops below 2.1.0_a06, so it looks safe — our inference, not a vendor statement

dell-inspiron-14-5418 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

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

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-295

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