Medium severity6.6NVD Advisory· Published Sep 23, 2020· Updated Jun 17, 2026

CVE-2019-1736

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Identity Services Engine Software3 versions
cpe:2.3:a:cisco:identity_services_engine:2.4\(0.357\):*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:cisco:identity_services_engine:2.4\(0.357\):*:*:*:*:*:*:*
- cpe:2.3:a:cisco:identity_services_engine:2.6\(0.156\):*:*:*:*:*:*:*
- (no CPE)range: n/a
Cisco Systems, Inc./Unified Computing System
cpe:2.3:a:cisco:unified_computing_system:3.2\(3h\)c:*:*:*:*:*:*:*
Cisco Systems, Inc./Fmc1000 K9 BIOS
cpe:2.3:o:cisco:fmc1000-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.1f.0
Cisco Systems, Inc./Fmc1000 K9 Firmware
cpe:2.3:o:cisco:fmc1000-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./Fmc2500 K9 BIOS
cpe:2.3:o:cisco:fmc2500-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.1f.0
Cisco Systems, Inc./Fmc2500 K9 Firmware
cpe:2.3:o:cisco:fmc2500-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./Fmc4500 K9 BIOS
cpe:2.3:o:cisco:fmc4500-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.1f.0
Cisco Systems, Inc./Fmc4500 K9 Firmware
cpe:2.3:o:cisco:fmc4500-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./Sns 3515 K9 BIOS
cpe:2.3:o:cisco:sns-3515-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.2d
Cisco Systems, Inc./Sns 3515 K9 Firmware
cpe:2.3:o:cisco:sns-3515-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./Sns 3595 K9 BIOS
cpe:2.3:o:cisco:sns-3595-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.2d
Cisco Systems, Inc./Sns 3595 K9 Firmware
cpe:2.3:o:cisco:sns-3595-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./Sns 3615 K9 BIOS
cpe:2.3:o:cisco:sns-3615-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.1i
Cisco Systems, Inc./Sns 3615 K9 Firmware
cpe:2.3:o:cisco:sns-3615-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.1g
Cisco Systems, Inc./Sns 3655 K9 BIOS
cpe:2.3:o:cisco:sns-3655-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.1i
Cisco Systems, Inc./Sns 3655 K9 Firmware
cpe:2.3:o:cisco:sns-3655-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.1g
Cisco Systems, Inc./Sns 3695 K9 BIOS
cpe:2.3:o:cisco:sns-3695-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.1i
Cisco Systems, Inc./Sns 3695 K9 Firmware
cpe:2.3:o:cisco:sns-3695-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.1g
Cisco Systems, Inc./Tg5004 K9 Rf BIOS
cpe:2.3:o:cisco:tg5004-k9-rf_bios:*:*:*:*:*:*:*:*
Range: <4.0.2d
Cisco Systems, Inc./Tg5004 K9 Rf Firmware
cpe:2.3:o:cisco:tg5004-k9-rf_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./Tg5004 K9 BIOS
cpe:2.3:o:cisco:tg5004-k9_bios:*:*:*:*:*:*:*:*
Range: <4.0.2d
Cisco Systems, Inc./Tg5004 K9 Firmware
cpe:2.3:o:cisco:tg5004-k9_firmware:*:*:*:*:*:*:*:*
Range: <4.0.2h
Cisco Systems, Inc./UCS C-Series Rack Serversllm-fuzzy

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypassnvdPatchVendor Advisory

News mentions

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