Home/CVE/Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS contain a heap-based buffer
CVE

CVE-2021-21555

Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS contain a heap-based buffer

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.

MEDIUM · CVSS 6.1 EPSS 0.00059
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Weakness Classification

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
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Affected Products & Versions

9
dell poweredge r640 firmware< 2.11.2
dell poweredge r740 firmware< 2.11.2
dell poweredge r740xd firmware< 2.11.2
dell poweredge r940 firmware< 2.11.2
dell poweredge r840 firmware< 2.11.2
dell poweredge r940xa firmware< 2.11.2
dell poweredge t640 firmware< 2.11.2
dell poweredge mx740c firmware< 2.11.2
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Scoring & Timeline

6.1
MEDIUM · CVSS v3.1 · security_alert@emc.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Jun 2021 · 07:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.dell.com/support/kbdoc/000187958Vendor Advisory
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