{"id":"CVE-2021-21556","aliases":["EUVD-2021-8828","GHSA-9fc4-hxq5-hwj6"],"status":"published","title":"Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS...","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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00306,"percentile":0.23677,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121","CWE-787"],"published":"2021-06-14T19:10:15Z","modified":"2026-06-17T03:35:46Z","products":[{"vendor":"dell","product":"poweredge bios intel 15g"},{"vendor":"dell","product":"poweredge_mx740c_firmware"},{"vendor":"dell","product":"poweredge_mx840c_firmware"},{"vendor":"dell","product":"poweredge_r640_firmware"},{"vendor":"dell","product":"poweredge_r740_firmware"},{"vendor":"dell","product":"poweredge_r740xd_firmware"},{"vendor":"dell","product":"poweredge_r840_firmware"},{"vendor":"dell","product":"poweredge_r940_firmware"},{"vendor":"dell","product":"poweredge_r940xa_firmware"},{"vendor":"dell","product":"poweredge_t640_firmware"}],"references":[{"url":"https://www.dell.com/support/kbdoc/000187958","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21556"},{"url":"https://github.com/advisories/GHSA-9fc4-hxq5-hwj6"}],"sources":{"cve":[{"id":"CVE-2021-21556","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.","status":"published","published":"2021-06-14T19:10:15.963Z","modified":"2024-09-17T01:40:39.312Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-8828","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.","status":"published","published":"2021-06-14T19:10:15Z","modified":"2024-09-17T01:40:39Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","level":"medium"}],"updated_at":"2026-11-03T00:28:47.904483Z"}],"ghsa":[{"id":"GHSA-9fc4-hxq5-hwj6","title":"Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS...","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.","status":"published","published":"2022-05-24T19:05:16Z","modified":"2023-01-29T05:06:33Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:46:03.455343Z"}],"nvd":[{"id":"CVE-2021-21556","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.","status":"published","published":"2021-06-14T19:15:08.353Z","modified":"2026-06-17T03:35:46.423Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-121","CWE-787"],"updated_at":"2026-11-02T14:06:54.892562Z"}]}}