SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

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.

MEDIUM 6.7EPSS 0.31%

Does this matter?

Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.

Description

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.

CVSS 3.1
6.7 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS
0.31% probability · 23th percentile
CISA KEV
Not listed
Weakness
CWE-121, CWE-787
Affected
dell/poweredge r640 firmware · dell/poweredge r740 firmware · dell/poweredge r740xd firmware · dell/poweredge r940 firmware · dell/poweredge r840 firmware · dell/poweredge r940xa firmware · dell/poweredge t640 firmware · dell/poweredge mx740c firmware · dell/poweredge mx840c firmware
Source
security_alert@emc.com

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.