SB2025032526 - Multiple vulnerabilities in Mbed TLS

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Main Vulnerability Database SB2025032526

SB2025032526 - Multiple vulnerabilities in Mbed TLS

Published: March 25, 2025

Security Bulletin ID SB2025032526
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Improper certificate validation (CVE-ID: CVE-2025-27809)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists within the client authentication process during certificate-based authentication. Due to insecure default behavior,  if a TLS client application does not call mbedtls_ssl_set_hostname(), the server verification step is skipped. As a result, a remote attacker can supply any valid certificate signed by a trusted CA and perform MitM attack.


2) Improper authentication (CVE-ID: CVE-2025-27810)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when handling memory allocations during TLS handshake. A remote attacker with ability to trigger memory allocation failures or cryptographic hardware failures can impersonate a legitimate peer by tampering with handshake messages.


Remediation

Install update from vendor's website.

References