Description
Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update.

This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.
Published: 2026-06-23
Score: 7.2 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Wed, 24 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Caliptra
Caliptra core Runtime Firmware
Vendors & Products Caliptra
Caliptra core Runtime Firmware

Wed, 24 Jun 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 24 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
Description Incorrect check of function return value in Caliptra Core Runtime Firmware (ActivateFirmwareCmd::activate_fw modules) allows bypass of Caliptra Core's verification of the MCU FW during a hitless update. This issue affects Core Runtime Firmware: from 2.0.0 through 2.0.1, 2.1.0.
Title MCU Firmware Update Authentication Bypass on Caliptra Core
Weaknesses CWE-253
References
Metrics cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H'}


Subscriptions

Caliptra Core Runtime Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: Caliptra

Published:

Updated: 2026-06-24T13:04:40.166Z

Reserved: 2026-04-08T15:45:10.928Z

Link: CVE-2026-5818

cve-icon Vulnrichment

Updated: 2026-06-24T13:04:36.471Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-24T16:05:22Z

Weaknesses