{"cve":"CVE-2021-3661","nvd":{"published":"2022-12-12T13:15:11.693","modified":"2026-06-17T04:05:31.487","status":"Modified","description":"A potential security vulnerability has been identified in certain HP Workstation BIOS (UEFI firmware) which may allow arbitrary code execution. HP is releasing firmware mitigations for the potential vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4},"cwes":["CWE-94"],"references":["https://support.hp.com/us-en/document/ish_5670997-5671021-16/hpsbhf03770","https://support.hp.com/us-en/document/ish_5670997-5671021-16/hpsbhf03770"],"products":["hp:z1_all-in-one_g3_firmware","hp:z238_microtower_firmware","hp:z240_small_form_factor_firmware","hp:z240_tower_firmware","hp:z2_mini_g3_firmware","hp:z2_mini_g4_firmware","hp:z2_mini_g5_firmware","hp:z2_small_form_factor_g4_firmware","hp:z2_small_form_factor_g5_firmware","hp:z2_small_form_factor_g8_firmware","hp:z2_tower_g4_firmware","hp:z2_tower_g5_firmware","hp:z2_tower_g8_firmware","hp:z440_firmware","hp:z4_g4_firmware","hp:z640_firmware","hp:z6_g4_firmware","hp:z840_firmware","hp:z8_g4_firmware","hp:zcentral_4r_firmware"],"source":"nvd","synced_at":"2026-10-19T21:37:28.463369388+00:00"},"epss":{"cve":"CVE-2021-3661","score":0.0032,"percentile":0.2503,"date":"2026-10-31"},"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."]}