{"cve":"CVE-2019-1736","nvd":{"published":"2020-09-23T01:15:14.300","modified":"2026-06-17T02:29:09.757","status":"Modified","description":"A vulnerability in the firmware of the Cisco UCS C-Series Rack Servers could allow an authenticated, physical attacker to bypass Unified Extensible Firmware Interface (UEFI) Secure Boot validation checks and load a compromised software image on an affected device. The vulnerability is due to improper validation of the server firmware upgrade images. An attacker could exploit this vulnerability by installing a server firmware version that would allow the attacker to disable UEFI Secure Boot. A successful exploit could allow the attacker to bypass the signature validation checks that are done by UEFI Secure Boot technology and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":6.6},"cwes":["CWE-347"],"references":["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass","https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass"],"products":["cisco:fmc1000-k9_bios","cisco:fmc1000-k9_firmware","cisco:fmc2500-k9_bios","cisco:fmc2500-k9_firmware","cisco:fmc4500-k9_bios","cisco:fmc4500-k9_firmware","cisco:identity_services_engine","cisco:sns-3515-k9_bios","cisco:sns-3515-k9_firmware","cisco:sns-3595-k9_bios","cisco:sns-3595-k9_firmware","cisco:sns-3615-k9_bios","cisco:sns-3615-k9_firmware","cisco:sns-3655-k9_bios","cisco:sns-3655-k9_firmware","cisco:sns-3695-k9_bios","cisco:sns-3695-k9_firmware","cisco:tg5004-k9-rf_bios","cisco:tg5004-k9-rf_firmware","cisco:tg5004-k9_bios","cisco:tg5004-k9_firmware","cisco:unified_computing_system"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2019-1736","score":0.00247,"percentile":0.16001,"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."]}