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CVE-2019-1736

Affected software10 products, listed below
Severity6.6 Medium CVSS 3.1 3 scores
WeaknessCWE-347
Published23 Sep 2020
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 6 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 0.25% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (cisco/identity_services_engine, cisco/unified_computing_system). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

CVSS

6.6 MEDIUM v3.1 CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.6 MEDIUM CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 3.0 6.2 MEDIUM CVSS:3.0/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H psirt@cisco.com Secondary
CVSS 2.0 6.9 none AV:L/AC:M/Au:N/C:C/I:C/A:C NVD Primary

Affected software and releases

Products and versions

22 products, 23 version entries
SourceVendorProductSchemeAffected versions
nvd cisco fmc1000-k9 bios generic < 4.0.1.0
nvd cisco fmc1000-k9 firmware generic < 4.0.2
nvd cisco fmc2500-k9 bios generic < 4.0.1.0
nvd cisco fmc2500-k9 firmware generic < 4.0.2
nvd cisco fmc4500-k9 bios generic < 4.0.1.0
nvd cisco fmc4500-k9 firmware generic < 4.0.2
nvd cisco identity services engine generic 2.4\(0.357\) · 2.6\(0.156\)
nvd cisco sns-3515-k9 bios generic < 4.0.2
nvd cisco sns-3515-k9 firmware generic < 4.0.2
nvd cisco sns-3595-k9 bios generic < 4.0.2
nvd cisco sns-3595-k9 firmware generic < 4.0.2
nvd cisco sns-3615-k9 bios generic < 4.0.1
nvd cisco sns-3615-k9 firmware generic < 4.0.1
nvd cisco sns-3655-k9 bios generic < 4.0.1
nvd cisco sns-3655-k9 firmware generic < 4.0.1
nvd cisco sns-3695-k9 bios generic < 4.0.1
nvd cisco sns-3695-k9 firmware generic < 4.0.1
nvd cisco tg5004-k9 bios generic < 4.0.2
nvd cisco tg5004-k9 firmware generic < 4.0.2
nvd cisco tg5004-k9-rf bios generic < 4.0.2
nvd cisco tg5004-k9-rf firmware generic < 4.0.2
nvd cisco unified computing system generic 3.2\(3h\)c

References

URLTags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200219-ucs-boot-bypass Patch, Vendor Advisory

Timeline

Published2020-09-23By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.