Unauthenticated malicious firmware uploads possible via physical access to CubeSpace CW0057 reaction wheels
Physical access to a CubeSpace CW0057 Reaction Wheel allows an attacker to upload unauthenticated, malicious firmware. This vulnerability stems from a failure to properly verify cryptographic signatures during the update process. Update your firmware to version 5.0.20 or later immediately to mitigate this risk.
Summary
A flaw in the firmware verification process of the CubeSpace CW0057 Reaction Wheel enables unauthorized firmware modifications. The vulnerability, tracked as CVE-2026-13743, resides in how the device validates the authenticity of incoming updates. Because the system fails to properly verify cryptographic signatures, any entity with physical access to the hardware can bypass authentication requirements to deploy arbitrary code via a malicious firmware image.
Technical details
The vulnerability is classified as an Improper Verification of Cryptographic Signature. In many embedded systems, digital signatures act as a gatekeeper, ensuring that only software signed by the manufacturer can be executed on the hardware. The CW0057 Reaction Wheel fails to enforce this check strictly.
An attacker capable of interacting with the device physically can present a custom-built firmware file. Since the signature verification mechanism is flawed, the device accepts the malicious file as legitimate. This allows for the complete replacement of the existing operating logic with any code provided by the attacker.
Affected products and fixed versions
The vulnerability impacts specific hardware models running outdated firmware. Users should check their current versioning to determine if they are at risk.
| Product | Vulnerable Firmware Versions | Fixed Firmware Version |
|---|---|---|
| CubeSpace CW0057 Reaction Wheel | Prior to 5.0.20 | 5.0.20 |
Why this matters for defenders
The primary risk associated with CVE-2026-13743 is the loss of integrity and availability of the reaction wheel hardware. While the CVSS score of 3.3 reflects a low severity rating, this is largely due to the requirement for physical access. However, in many industrial or satellite-adjacent environments, physical access to components during maintenance or deployment can be a significant vector.
If an attacker successfully uploads malicious firmware, they gain control over the device's functions. For a reaction wheel-a critical component used for attitude control and orientation-unauthorized changes to its operational logic could lead to hardware failure or unpredictable movement.
Defender guidance
The most effective defense is to update all CubeSpace CW0057 Reaction Wheels to firmware version 5.0.20 or higher. This update addresses the signature verification flaw by ensuring that only authentic, manufacturer-signed firmware can be installed on the device.
Beyond patching, defenders should implement strict physical security controls around hardware components. Since this exploit requires direct interaction with the device to facilitate a firmware upload, limiting who can access the hardware and monitoring for unauthorized physical tampering is a necessary layer of defense. Ensure that all hardware deployment procedures include a verification step to confirm that the installed firmware matches the expected versioning provided by CubeBug/CubeSpace.
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