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Improper Signature VerificationWeakness · CWE-347

CVE-2026-22097

CRITICAL · 9.3 CVSS v4.0 Published 2026-07-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 5 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The firmware update mechanism does not include cryptographic signature validation. This allows anyone with access to the firmware update capability to upload arbitrary files which can then lead to arbitrary code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

The firmware update mechanism lacks cryptographic signature validation, enabling unauthenticated attackers with update access to upload malicious firmware images. This bypasses trust boundaries in the boot chain, allowing arbitrary code execution at the firmware level.

MitigationImplement cryptographic signature validation for all firmware updates using asymmetric digital signatures, with public key validation occurring in immutable boot ROM or secure hardware.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device or product and its firmware version
    Locate the firmware version through device settings, CLI interface, boot logs, or by extracting and analyzing the firmware image for version strings
    Affected if The installed firmware version cannot be determined or is an unpatched release that may lack signature validation in the update mechanism
  2. Inspect firmware update mechanism configuration
    Access the firmware update settings or configuration files (such as update.conf, flash.cfg, or vendor-specific update modules) and search for signature verification, validation, or cryptographic checks
    Affected if Signature validation is disabled, set to optional, or absent from the update configuration entirely
  3. Verify secure boot or boot chain integrity settings
    Check the boot configuration, boot loader settings, or secure boot registers to confirm that firmware images are validated before execution (look for settings like 'secure boot enabled', 'signature check', or 'boot verification')
    Affected if Secure boot is disabled, not enforced, or the boot chain does not verify cryptographic signatures of loaded firmware
  4. Test firmware update access controls
    Attempt to access the firmware update interface with insufficient privileges or without proper authentication to determine if update access is properly restricted
    Affected if Unauthenticated or unauthorized access to the firmware update mechanism is possible, allowing malicious firmware to be uploaded
  5. Examine boot ROM or immutable boot code for public key validation
    Inspect boot ROM documentation, secure hardware configuration, or hardware security module settings to verify that the public key used for signature validation is stored in immutable, write-protected storage
    Affected if The validation key is stored in modifiable memory or storage, allowing attackers to inject their own validation key and bypass signature checks

A user is affected if the firmware update mechanism does not enforce cryptographic signature validation or if the secure boot chain does not verify firmware signatures before execution.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement cryptographic signature validation for all firmware updates using asymmetric digital signatures, with public key validation occurring in immutable boot ROM or secure hardware.

Have this fixed Scoped from the published advisory
  • Consultation6.0 h
  • Implementation24.0 h
  • Testing12.0 h
  • Review / QA6.0 h
48.0 hours of engineering $8,400
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-22097 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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