CVE-2025-7844 Memory corruption in wolfTPM
Attacker can trigger stack buffer overflow in wolfTPM by exporting large RSA keys if MAX_RSA_KEY_BITS is misconfigured, risking code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-7844?
CVE-2025-7844 is a low-severity memory corruption vulnerability in wolfSSL Inc. wolfTPM, published on 4 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-121
Which versions are affected by CVE-2025-7844?
How do I fix CVE-2025-7844?
No fix has been published for CVE-2025-7844 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-7844 being exploited?
There is no known exploitation of CVE-2025-7844 in the wild and no public exploit code.
Sources
Also known as GHSA-c7fc-3c5j-j956.