Is CVE-2021-21557 in the CISA KEV catalog?

No. CVE-2021-21557 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21557?

CVE-2021-21557 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-21557?

CVE-2021-21557 has an EPSS score of 0.35% (27th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21557?

Upgrade poweredge c4140 firmware to 2.11.2 or later. Fixes are available for 31 affected products.

CVE & CISA-KEV Catalog

CVE-2021-21557

HIGH

8.1

CVSS v3

NVD

Description

Dell PowerEdge Server BIOS and select Dell Precision Rack BIOS contain an out-of-bounds array access vulnerability. 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 System Management Mode.

CWE-20Improper Input Validation CWE-125Out-of-bounds Read

How to fix

Remediation Available

poweredge c4140 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge c6420 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge c6525 firmwareNVD

Affected:< 2.2.4Fixed in:2.2.4CVE-2021-21557derived from NVD

poweredge fc640 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge m640 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge m640p firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge mx740c firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge mx840c firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r240 firmwareNVD

Affected:< 2.5.1Fixed in:2.5.1CVE-2021-21557derived from NVD

poweredge r340 firmwareNVD

Affected:< 2.5.1Fixed in:2.5.1CVE-2021-21557derived from NVD

poweredge r440 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r540 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r640 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r6415 firmwareNVD

Affected:< 1.16.1Fixed in:1.16.1CVE-2021-21557derived from NVD

poweredge r6515 firmwareNVD

Affected:< 2.2.4Fixed in:2.2.4CVE-2021-21557derived from NVD

poweredge r6525 firmwareNVD

Affected:< 2.2.5Fixed in:2.2.5CVE-2021-21557derived from NVD

poweredge r740 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r740xd2 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r740xd firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r7415 firmwareNVD

Affected:< 1.16.1Fixed in:1.16.1CVE-2021-21557derived from NVD

poweredge r7425 firmwareNVD

Affected:< 1.16.1Fixed in:1.16.1CVE-2021-21557derived from NVD

poweredge r7515 firmwareNVD

Affected:< 2.2.4Fixed in:2.2.4CVE-2021-21557derived from NVD

poweredge r7525 firmwareNVD

Affected:< 2.2.5Fixed in:2.2.5CVE-2021-21557derived from NVD

poweredge r840 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r940 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge r940xa firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge t140 firmwareNVD

Affected:< 2.5.1Fixed in:2.5.1CVE-2021-21557derived from NVD

poweredge t340 firmwareNVD

Affected:< 2.5.1Fixed in:2.5.1CVE-2021-21557derived from NVD

poweredge t440 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge t640 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

poweredge xr2 firmwareNVD

Affected:< 2.11.2Fixed in:2.11.2CVE-2021-21557derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L

Exploit Intelligence

0.35%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Patch1

dell.com

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.