CVE-2025-7844
wolfTPM library wrapper function `wolfTPM2_RsaKey_TpmToWolf` copies external data to a fixed-size stack buffer without length validation potentially causing stack-based buffer overflow
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.
Attack profile
How easy it is to exploit
- Attack vector
- Physical
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
wolfTPM library wrapper function `wolfTPM2_RsaKey_TpmToWolf` copies external data to a fixed-size stack buffer without length validation potentially causing stack-based buffer overflow
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.
- Record
CVE-2025-7844- CVSS 4.0
- 1.0 Low
CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Green - Weakness
- CWE-121
- Updated
- 2026-11-02
EUVDEUVD-2025-23559
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.
- Record
EUVD-2025-23559- CVSS 4.0
- 1.0 Low
CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Green - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c7fc-3c5j-j956
Exporting a TPM based RSA key larger than 2048 bits from the TPM could overrun a stack buffer if...
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.
- Record
GHSA-c7fc-3c5j-j956- CVSS 4.0
- 1.0 Low
CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/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:Green - Weakness
- CWE-121
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-7844- CVSS 4.0
- 1.0 Low
CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/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:Green - Weakness
- CWE-121
- Updated
- 2026-11-02
OSV
wolfTPM library wrapper function `wolfTPM2_RsaKey_TpmToWolf` copies external data to a fixed-size stack buffer without length validation potentially causing stack-based buffer overflow
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.
- Record
CVE-2025-7844- CVSS 4.0
- 1.0 Low
CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/U:Green - Weakness
- CWE-121
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-7844 is a low vulnerability (CVSS 1.0) in Wolfssl Inc. Wolftpm, published August 4, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. No source names a fixed version.