CVE-2021-21554

MEDIUM

6.7

CVSS Score

Published: June 14, 2021 at 07:10 PM UTC

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

19 products affected across 1 vendorPoweredge R640 FirmwarePoweredge MX740C FirmwarePoweredge R940XA Firmware

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Severity

MEDIUM6.7

Exploit prediction

EPSS 0.3%

Description

Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and, Dell Precision 7920 Rack Workstation BIOS contain a stack-based buffer overflow vulnerability in systems with Intel Optane DC Persistent Memory installed. A local malicious user with high privileges may potentially exploit this vulnerability, leading to a denial of Service, arbitrary code execution, or information disclosure in UEFI or BIOS Preboot Environment.

Affected

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

Poweredge MX740C Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge MX840C Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge R640 Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge R740 Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge R740XD Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge R840 Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge R940 Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Poweredge R940XA Firmware · Dell

95%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

Precision 7920 Firmware · Dell

95%

All versions

dell-precision-7920 (same device)

PowerEdge MX740C · Dell

90%

v < 2.9.4

Affected range stops below 2.9.4, so it looks safe — our inference, not a vendor statement

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/000187958

References (1)

x_refsource_MISCPatchVendor Advisory

Source: [email protected]

https://www.dell.com/support/kbdoc/000187958

CVSS

6.7MEDIUM[email protected]

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

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-122CWE-787

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