{"cve":"CVE-2021-21571","nvd":{"published":"2021-06-24T17:15:07.717","modified":"2026-06-17T03:35:47.977","status":"Modified","description":"Dell UEFI BIOS https stack leveraged by the Dell BIOSConnect feature and Dell HTTPS Boot feature contains an improper certificate validation vulnerability. A remote unauthenticated attacker may exploit this vulnerability using a person-in-the-middle attack which may lead to a denial of service and payload tampering.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","score":6.5},"cwes":["CWE-295"],"references":["https://www.dell.com/support/kbdoc/en-us/000188682","https://www.dell.com/support/kbdoc/en-us/000188682"],"products":["dell:alienware_m15_r6_firmware","dell:chengming_3990_firmware","dell:chengming_3991_firmware","dell:g15_5510_firmware","dell:g15_5511_firmware","dell:g3_3500_firmware","dell:g5_5500_firmware","dell:g7_7500_firmware","dell:g7_7700_firmware","dell:inspiron_14_5418_firmware","dell:inspiron_15_5518_firmware","dell:inspiron_15_7510_firmware","dell:inspiron_3501_firmware","dell:inspiron_3880_firmware","dell:inspiron_3881_firmware","dell:inspiron_3891_firmware","dell:inspiron_5300_firmware","dell:inspiron_5301_firmware","dell:inspiron_5310_firmware","dell:inspiron_5400_2-in-1_firmware","dell:inspiron_5400_aio_firmware","dell:inspiron_5401_aio_firmware","dell:inspiron_5401_firmware","dell:inspiron_5402_firmware","dell:inspiron_5406_2n1_firmware","dell:inspiron_5408_firmware","dell:inspiron_5409_firmware","dell:inspiron_5410_2-in-1_firmware","dell:inspiron_5501_firmware","dell:inspiron_5502_firmware","dell:inspiron_5508_firmware","dell:inspiron_5509_firmware","dell:inspiron_7300_2-in-1_firmware","dell:inspiron_7300_firmware","dell:inspiron_7306_2-in-1_firmware","dell:inspiron_7400_firmware","dell:inspiron_7500_2-in-1_firmware","dell:inspiron_7500_firmware","dell:inspiron_7501_firmware","dell:inspiron_7506_firmware","dell:inspiron_7610_firmware","dell:inspiron_7700_aio_firmware","dell:inspiron_7706_2-in-1_firmware","dell:latitude_3120_firmware","dell:latitude_3320_firmware","dell:latitude_3410_firmware","dell:latitude_3420_firmware","dell:latitude_3510_firmware","dell:latitude_3520_firmware","dell:latitude_5310_2-in-1_firmware"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-21571","score":0.00539,"percentile":0.45405,"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."]}