CVE-2021-21556
6.1 · MEDIUMOverview
CVE-2021-21556 is a medium-severity vulnerability affecting dell poweredge_r640_firmware. It was published on June 14, 2021 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from dell. Update poweredge_r640_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| dell | poweredge_r640_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_r740_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_r740xd_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_r940_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_r840_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_r940xa_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_t640_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_mx740c_firmware | >= 0, < 2.11.2 | Affected |
| dell | poweredge_mx840c_firmware | >= 0, < 2.11.2 | Affected |
Frequently Asked Questions
What is CVE-2021-21556?
CVE-2021-21556 is a medium-severity vulnerability affecting dell poweredge_r640_firmware. It was published on June 14, 2021 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2021-21556?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-21556?
Check the references section for vendor advisories and patches from dell. Update poweredge_r640_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-21556?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-21556 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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