wolfSSL wolfTPM up to 3.9.2 stack-based overflow

Summaryinfo

A vulnerability classified as critical was found in wolfSSL wolfTPM up to 3.9.2. Impacted is an unknown function. Such manipulation leads to stack-based overflow. This vulnerability is uniquely identified as CVE-2025-7844. The attack can be executed directly on the physical device. No exploit exists. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in wolfSSL wolfTPM up to 3.9.2. It has been rated as problematic. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is availability. CVE summarizes:

Exporting a TPM based RSA key larger than 2048 bits from the TPM could overrun a stack buffer if the default `MAX_RSA_KEY_BITS=2048` is used. If your TPM 2.0 module supports RSA key sizes larger than 2048 bit and your applications supports creating or importing an RSA private or public key larger than 2048 bits and your application calls `wolfTPM2_RsaKey_TpmToWolf` on that key, then a stack buffer could be overrun. If the `MAX_RSA_KEY_BITS` build-time macro is set correctly (RSA bits match what TPM hardware is capable of) for the hardware target, then a stack overrun is not possible.

The weakness was disclosed by Richard Mitev, Giannis Mouzenidis and Patrick Jauernig. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-7844 since 07/18/2025. The exploitation is known to be difficult. The attack needs to be approached locally. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Vendor

• wolfSSL

Name

• wolfTPM

Version

• 3.9.0
• 3.9.1
• 3.9.2

License

• open-source

Website

• Product: https://github.com/wolfSSL/wolfTPM/

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