{"cve":"CVE-2021-21557","nvd":{"published":"2021-06-14T19:15:08.497","modified":"2026-06-17T03:35:46.543","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","score":6.7},"cwes":["CWE-125","CWE-20"],"references":["https://www.dell.com/support/kbdoc/000187958","https://www.dell.com/support/kbdoc/000187958"],"products":["dell:poweredge_c4140_firmware","dell:poweredge_c6420_firmware","dell:poweredge_c6525_firmware","dell:poweredge_fc640_firmware","dell:poweredge_m640_firmware","dell:poweredge_m640p_firmware","dell:poweredge_mx740c_firmware","dell:poweredge_mx840c_firmware","dell:poweredge_r240_firmware","dell:poweredge_r340_firmware","dell:poweredge_r440_firmware","dell:poweredge_r540_firmware","dell:poweredge_r640_firmware","dell:poweredge_r6415_firmware","dell:poweredge_r6515_firmware","dell:poweredge_r6525_firmware","dell:poweredge_r740_firmware","dell:poweredge_r740xd2_firmware","dell:poweredge_r740xd_firmware","dell:poweredge_r7415_firmware","dell:poweredge_r7425_firmware","dell:poweredge_r7515_firmware","dell:poweredge_r7525_firmware","dell:poweredge_r840_firmware","dell:poweredge_r940_firmware","dell:poweredge_r940xa_firmware","dell:poweredge_t140_firmware","dell:poweredge_t340_firmware","dell:poweredge_t440_firmware","dell:poweredge_t640_firmware","dell:poweredge_xr2_firmware"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-21557","score":0.00346,"percentile":0.28165,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}