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Vulnerability record · CVE-2021-21540 · published 30 April 2021

CVE-2021-21540: Dell idrac9 firmware stack-based buffer overflow vulnerability

Dell · Idrac9 Firmware

Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a stack-based overflow vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to overwrite configuration information by injecting arbitrarily large payload.

8.1 CVSS 3.1 High EPSS 1.2% · top 34.3% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
8.1CVSS 3.1 base score, v2 5.5
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a stack-based overflow vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to overwrite configuration information by injecting arbitrarily large payload.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.dell.com/support/kbdoc/000185293 Vendor Advisory
https://www.dell.com/support/kbdoc/000185293 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2021-21538Dell idrac9 firmware improper authentication vulnerabilityDell EMC iDRAC9 versions 4.40.00.00 and later, but prior to 4.40.10.00, contain an improper authentication vulnerability. A remote unauthenticated at…EPSS 1.7%9.8CVE-2020-5344Dell idrac7 firmware stack-based buffer overflow vulnerabilityDell EMC iDRAC7, iDRAC8 and iDRAC9 versions prior to 2.65.65.65, 2.70.70.70, 4.00.00.00 contain a stack-based buffer overflow vulnerability. An unaut…EPSS 3.8%9.8CVE-2019-3705Dell idrac6 firmware classic buffer overflow vulnerabilityDell EMC iDRAC6 versions prior to 2.92, iDRAC7/iDRAC8 versions prior to 2.61.60.60, and iDRAC9 versions prior to 3.20.21.20, 3.21.24.22, 3.21.26.22 a…EPSS 4.2%9.8CVE-2019-3706Dell idrac9 firmware vulnerabilityDell EMC iDRAC9 versions prior to 3.24.24.24, 3.21.26.22, 3.22.22.22 and 3.21.25.22 contain an authentication bypass vulnerability. A remote attacker…EPSS 3.3%9.8CVE-2019-3707Dell idrac9 firmware vulnerabilityDell EMC iDRAC9 versions prior to 3.30.30.30 contain an authentication bypass vulnerability. A remote attacker may potentially exploit this vulnerabi…EPSS 3.3%8.8CVE-2018-15774Dell idrac7 firmware incorrect authorization vulnerabilityDell EMC iDRAC7/iDRAC8 versions prior to 2.61.60.60 and iDRAC9 versions prior to 3.20.21.20, 3.21.24.22, 3.21.26.22, and 3.23.23.23 contain a privile…EPSS 0.94%8.8CVE-2018-1244Dell idrac7 firmware command injection vulnerabilityDell EMC iDRAC7/iDRAC8, versions prior to 2.60.60.60, and iDRAC9 versions prior to 3.21.21.21 contain a command injection vulnerability in the SNMP a…EPSS 3.4%7.5CVE-2018-1243Dell idrac6 firmware vulnerabilityDell EMC iDRAC6, versions prior to 2.91, iDRAC7/iDRAC8, versions prior to 2.60.60.60 and iDRAC9, versions prior to 3.21.21.21, contain a weak CGI ses…EPSS 1.8%

Source: NIST National Vulnerability Database (record CVE-2021-21540), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.