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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

Quick assessment

Affected
wolfSSL Inc. wolfTPM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wolfTPM是wolfSSL开源的一个高度可移植的TPM库。 wolfTPM存在安全漏洞，该漏洞源于导出大于2048位的RSA密钥可能导致栈缓冲区溢出。

AI Predicted 6.8 Difficulty: Moderate EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-7844

Vulnerability Information
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Vulnerability Title
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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
wolfTPM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfTPM是wolfSSL开源的一个高度可移植的TPM库。 wolfTPM存在安全漏洞，该漏洞源于导出大于2048位的RSA密钥可能导致栈缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL Inc. wolfTPM 0 ~ 3.9.2 -

II. Public POCs for CVE-2025-7844

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III. Intelligence Information for CVE-2025-7844

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IV. Related Vulnerabilities

Same vendor: wolfSSL Inc.
Same weakness: CWE-121

V. Comments for CVE-2025-7844

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