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CVE-2025-49133— Libtpms contains a possible out-of-bound access and abort due to HMAC signing issue

Quick assessment

Affected
stefanberger libtpms
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.

libtpms是Stefan Berger个人开发者的一个可信平台模块的软件仿真。 libtpms存在缓冲区错误漏洞，该漏洞源于CryptHmacSign函数存在越界读取，可能导致服务中断。

CVSS 5.9 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2025-49133

Vulnerability Information
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Vulnerability Title
Libtpms contains a possible out-of-bound access and abort due to HMAC signing issue
Source: CVE Program / CVE List V5
Vulnerability Description
Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the ‘CryptHmacSign’ function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHASH key and inScheme is an ECC or RSA scheme. The reported vulnerability is in the ‘CryptHmacSign’ function, which is defined in the "Part 4: Supporting Routines – Code" document, section "7.151 - /tpm/src/crypt/CryptUtil.c ". This vulnerability can be triggered from user-mode applications by sending malicious commands to a TPM 2.0/vTPM (swtpm) whose firmware is based on an affected TCG reference implementation. The effect on libtpms is that it will cause an abort due to the detection of the out-of-bounds access, thus for example making a vTPM (swtpm) unavailable to a VM. This vulnerability is fixed in 0.7.12, 0.8.10, 0.9.7, and 0.10.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
libtpms 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libtpms是Stefan Berger个人开发者的一个可信平台模块的软件仿真。 libtpms存在缓冲区错误漏洞，该漏洞源于CryptHmacSign函数存在越界读取，可能导致服务中断。
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
stefanberger libtpms = 0.7.11 -

II. Public POCs for CVE-2025-49133

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III. Intelligence Information for CVE-2025-49133

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Vendor Advisories for CVE-2025-49133 (1)

IV. Related Vulnerabilities

Same product: libtpms
Same vendor: stefanberger
Same weakness: CWE-125

V. Comments for CVE-2025-49133

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