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CVE-2021-21555

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 T640 Server BIOS contain a heap-based buffer overflow vulnerability in systems with NVDIMM-N 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 < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge MX840C Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge R640 Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge R740 Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge R740XD Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge R840 Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge R940 Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge R940XA Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
Poweredge T640 Firmware· Dell
95%
v < 2.11.2
Affected range stops below 2.11.2, so it looks safe — our inference, not a vendor statement
PowerEdge MX740C· Dell
90%
v < 2.11.2
Affected range stops below 2.11.2, 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

References (1)

x_refsource_MISCVendor 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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