Vulnerability Details : CVE-2021-21556
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.
Vulnerability category: OverflowMemory CorruptionDenial of serviceInformation leak
Products affected by CVE-2021-21556
- cpe:2.3:o:dell:poweredge_r640_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_r740_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_r740xd_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_r940_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_r840_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_r940xa_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_t640_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_mx740c_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:dell:poweredge_mx840c_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-21556
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-21556
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
|
6.7
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST | |
|
6.1
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L |
0.6
|
5.5
|
Dell |
CWE ids for CVE-2021-21556
-
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).Assigned by: security_alert@emc.com (Secondary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-21556
-
https://www.dell.com/support/kbdoc/000187958
Access DeniedVendor Advisory
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