CVE-2019-1736

What it is

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.

At a glance

Exploitability

Can be exploited with physical access with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-09-23 01:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 6.6 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-09-23 01:15 UTC

Last modified

2026-06-17 02:29 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-347

Record status

Modified

Affected

• Cisco fmc1000-k9 Bios < 4.0.1f.0
• Cisco fmc1000-k9 Firmware < 4.0.2h
• Cisco fmc2500-k9 Bios < 4.0.1f.0
• Cisco fmc2500-k9 Firmware < 4.0.2h
• Cisco fmc4500-k9 Bios < 4.0.1f.0
• Cisco fmc4500-k9 Firmware < 4.0.2h
• Cisco sns-3515-k9 Bios < 4.0.2d
• Cisco sns-3515-k9 Firmware < 4.0.2h

Attack profile CVSS 3.1 · 6.6

Attack vector

Physical

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1736.md and follow it. Check whether this project is affected by CVE-2019-1736. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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