CVE-2019-1736

mediumpriority · track · 26EPSS 0.002 · 16 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.25% (16th) EPSS

CVSS 6.9 · medium

Is it mine?

31 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Identity Services Engine Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Unified Computing System (Managed)cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

6.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.06.9mediumAV:L/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 3.4 · impact 10

v3.16.6mediumCVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 0.7 · impact 5.9

v3.06.2mediumCVSS:3.0/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.06.2mediumCVSS:3.0/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@cisco.com USexploitability 0.3 · impact 5.9

v3.06.2mediumCVSS:3.0/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US

v3.16.2mediumAV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.16.1mediumCVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-347USprimaryCWE-347US

affected products (31)

Products and version ranges known to be affected.

Cisco Cisco Identity Services Engine Softwareall versionscisco_csafUS
Cisco Cisco Unified Computing System (Managed)all versionscisco_csafUS
Cisco Cisco Identity Services Engine Software≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco Firepower Management Center4.0.1f.0 → 4.0.2hfstec_bduRU
Cisco Systems Inc. Integrated Management Controller4.0.2h → 4.0.4hfstec_bduRU
Cisco Systems Inc. Secure Network Server 35004.0.4d → 4.0.4hfstec_bduRU
Cisco Systems Inc. Secure Network Server 36004.0.4i → 4.0.4hfstec_bduRU
Cisco Systems Inc. Threat Grid 55044.0.2d → 4.0.2hfstec_bduRU
cisco fmc1000-k9 bios< 4.0.1f.0nvdUScpe:2.3:o:cisco:fmc1000-k9_bios:*:*:*:*:*:*:*:*
cisco fmc1000-k9 firmware< 4.0.2hnvdUScpe:2.3:o:cisco:fmc1000-k9_firmware:*:*:*:*:*:*:*:*
cisco fmc2500-k9 bios< 4.0.1f.0nvdUScpe:2.3:o:cisco:fmc2500-k9_bios:*:*:*:*:*:*:*:*
cisco fmc2500-k9 firmware< 4.0.2hnvdUScpe:2.3:o:cisco:fmc2500-k9_firmware:*:*:*:*:*:*:*:*
cisco fmc4500-k9 bios< 4.0.1f.0nvdUScpe:2.3:o:cisco:fmc4500-k9_bios:*:*:*:*:*:*:*:*
cisco fmc4500-k9 firmware< 4.0.2hnvdUScpe:2.3:o:cisco:fmc4500-k9_firmware:*:*:*:*:*:*:*:*
cisco identity services engine= 2.4(0.357)nvdUScpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:*
cisco identity services engine= 2.6(0.156)nvdUScpe:2.3:a:cisco:identity_services_engine:*:*:*:*:*:*:*:*
cisco sns-3515-k9 bios< 4.0.2dnvdUScpe:2.3:o:cisco:sns-3515-k9_bios:*:*:*:*:*:*:*:*
cisco sns-3515-k9 firmware< 4.0.2hnvdUScpe:2.3:o:cisco:sns-3515-k9_firmware:*:*:*:*:*:*:*:*
cisco sns-3595-k9 bios< 4.0.2dnvdUScpe:2.3:o:cisco:sns-3595-k9_bios:*:*:*:*:*:*:*:*
cisco sns-3595-k9 firmware< 4.0.2hnvdUScpe:2.3:o:cisco:sns-3595-k9_firmware:*:*:*:*:*:*:*:*

showing 20 of 31

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-20200219-ucs-boot-bypassMultiple Cisco UCS-Based Products UEFI Secure Boot Bypass Vulnerability2020-02-19csaf · cisco_csafUS
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. There are no workarounds that address this vulnerability. Cisco has released firmware updates that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass"]

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2020-09-23modified 2026-06-17

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references (5)

External citations — patches, advisories, analysis.

scry

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