# Firmware verification fails to enforce required product binding

An otherwise authentic image is accepted for an incompatible product or security configuration despite required target restrictions.

**Candidate CWE:** [CWE-20](https://cwe.mitre.org/data/definitions/20.html)

## Test hypothesis

Using format-valid local fixtures, compare the correct SKU/board/security variant with a different owned variant while holding signature validity constant. Inspect the actual compatibility gate without flashing.

## Evidence required

Product identifiers, expected compatibility rule, verified manifest fields and acceptance stage; execution impact requires additional faithful evidence.

## Rule out false positives

Vendors may intentionally ship one image across several SKUs; names differing is not proof of incompatibility.

## Playbook and command references

- [Firmware update and boot trust: signed bytes, product binding and rollback](https://bug-bounty-field-manual.kmahshooq.chatgpt.site/modules/firmware-update.html) — Separate download trust, update authorization, image verification, rollback policy and boot enforcement using local artifacts.

[Find the associated command snippets](https://bug-bounty-field-manual.kmahshooq.chatgpt.site/commands.html?q=Firmware%20update%20and%20boot%20trust%3A%20signed%20bytes%2C%20product%20binding%20and%20rollback)

## Referenced by these target playbooks

[Hardware & firmware](https://bug-bounty-field-manual.kmahshooq.chatgpt.site/hardware.html) · [OSS & self-hosted](https://bug-bounty-field-manual.kmahshooq.chatgpt.site/oss.html)

## Report checklist

- [ ] Capture the affected version, configuration, identities, and object ownership.
- [ ] Preserve a valid baseline and a negative control.
- [ ] Reproduce the forbidden data access, action, or state change on controlled fixtures.
- [ ] Explain the intended security rule and why the observed behavior violates it.
- [ ] State prerequisites, uncertainty, cleanup, and the smallest demonstrated impact.

## Conditional ATT&CK mapping

No direct ATT&CK mapping selected. Record the weakness and demonstrated impact without forcing an adversary-behavior classification. See the [mapping guide](https://bug-bounty-field-manual.kmahshooq.chatgpt.site/attack.html).

## Primary references

- [OWASP firmware update tests](https://github.com/OWASP/owasp-istg/blob/main/src/03_test_cases/firmware/firmware_update_mechanism.md)
- [Espressif Secure Boot v2](https://docs.espressif.com/projects/esp-idf/en/stable/esp32/security/secure-boot-v2.html)

[Back to the complete vulnerability catalog](https://bug-bounty-field-manual.kmahshooq.chatgpt.site/vulnerabilities.html)