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CVE-2025-49601

Quick assessment

Affected
Mbed mbedtls
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.

Mbed TLS是Mbed TLS开源的一个开源、可移植、易于使用、可读且灵活的 SSL 库。 Mbed TLS 3.6.4之前版本存在缓冲区错误漏洞，该漏洞源于未检查输入缓冲区大小，可能导致越界读取。

CVSS 4.8 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2025-49601

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_import_public_key does not check that the input buffer is at least 4 bytes before reading a 32-bit field, allowing a possible out-of-bounds read on truncated input. Specifically, an out-of-bounds read in mbedtls_lms_import_public_key allows context-dependent attackers to trigger a crash or limited adjacent-memory disclosure by supplying a truncated LMS (Leighton-Micali Signature) public-key buffer under four bytes. An LMS public key starts with a 4-byte type indicator. The function mbedtls_lms_import_public_key reads this type indicator before validating the size of its input.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Mbed TLS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mbed TLS是Mbed TLS开源的一个开源、可移植、易于使用、可读且灵活的 SSL 库。 Mbed TLS 3.6.4之前版本存在缓冲区错误漏洞，该漏洞源于未检查输入缓冲区大小，可能导致越界读取。
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
Mbed mbedtls 3.3.0 ~ 3.6.4 -

II. Public POCs for CVE-2025-49601

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III. Intelligence Information for CVE-2025-49601

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Vendor Advisories for CVE-2025-49601 (1)

Same Patch Batch · Mbed · 2025-07-04 · 4 CVEs total

CVE-2025-52496 7.8 HIGH Mbed TLS 安全漏洞
CVE-2025-49600 4.9 MEDIUM Mbed TLS 安全漏洞
CVE-2025-52497 4.8 MEDIUM Mbed TLS 安全漏洞

IV. Related Vulnerabilities

Same product: mbedtls
Same vendor: Mbed
Same weakness: CWE-125

V. Comments for CVE-2025-49601

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