{"id":"CVE-2019-1736","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-1736","generatedAt":"2026-10-27T21:18:43.184Z","title":"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…","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.","published":"2020-09-23T01:15:14.000Z","lastModified":"2026-06-17T02:29:10.000Z","status":"Modified","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"3.1","score":6.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-347"],"affected":["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/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 bios","cisco/tg5004-k9 firmware","cisco/tg5004-k9-rf bios","cisco/tg5004-k9-rf firmware","cisco/identity services engine","cisco/unified computing system"],"epss":{"score":0.00247,"percentile":0.15802,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.25%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass","tags":["Patch","Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-1736","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}