// For flags

CVE-2021-21556

 

Severity Score

6.7
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS contain a stack-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.

Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, y T640 Server BIOS contienen una vulnerabilidad de desbordamiento del búfer en la región stack de la memoria en sistemas con NVDIMM-N instalados. Un usuario local malicioso con privilegios elevados puede explotar potencialmente esta vulnerabilidad, conllevando a una denegación de servicio, una ejecución de código arbitrario o una divulgación de información en UEFI o BIOS Preboot Environment

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-01-04 CVE Reserved
  • 2021-06-14 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-09-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-121: Stack-based Buffer Overflow
  • CWE-787: Out-of-bounds Write
CAPEC
References (1)
URL Tag Source
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Dell
Search vendor "Dell"
Poweredge R640 Firmware
Search vendor "Dell" for product "Poweredge R640 Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge R640 Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge R640
Search vendor "Dell" for product "Poweredge R640"
--
Safe
Dell
Search vendor "Dell"
Poweredge R740 Firmware
Search vendor "Dell" for product "Poweredge R740 Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge R740 Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge R740
Search vendor "Dell" for product "Poweredge R740"
--
Safe
Dell
Search vendor "Dell"
Poweredge R740xd Firmware
Search vendor "Dell" for product "Poweredge R740xd Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge R740xd Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge R740xd
Search vendor "Dell" for product "Poweredge R740xd"
--
Safe
Dell
Search vendor "Dell"
Poweredge R940 Firmware
Search vendor "Dell" for product "Poweredge R940 Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge R940 Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge R940
Search vendor "Dell" for product "Poweredge R940"
--
Safe
Dell
Search vendor "Dell"
Poweredge R840 Firmware
Search vendor "Dell" for product "Poweredge R840 Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge R840 Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge R840
Search vendor "Dell" for product "Poweredge R840"
--
Safe
Dell
Search vendor "Dell"
Poweredge R940xa Firmware
Search vendor "Dell" for product "Poweredge R940xa Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge R940xa Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge R940xa
Search vendor "Dell" for product "Poweredge R940xa"
--
Safe
Dell
Search vendor "Dell"
Poweredge T640 Firmware
Search vendor "Dell" for product "Poweredge T640 Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge T640 Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge T640
Search vendor "Dell" for product "Poweredge T640"
--
Safe
Dell
Search vendor "Dell"
Poweredge Mx740c Firmware
Search vendor "Dell" for product "Poweredge Mx740c Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge Mx740c Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge Mx740c
Search vendor "Dell" for product "Poweredge Mx740c"
--
Safe
Dell
Search vendor "Dell"
Poweredge Mx840c Firmware
Search vendor "Dell" for product "Poweredge Mx840c Firmware"
< 2.11.2
Search vendor "Dell" for product "Poweredge Mx840c Firmware" and version " < 2.11.2"
-
Affected
in Dell
Search vendor "Dell"
Poweredge Mx840c
Search vendor "Dell" for product "Poweredge Mx840c"
--
Safe