Insecure Default Initialization of Resource Affecting armmbed/mbedtls package, versions [,2.28.10)[3.0.0,3.6.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ARMMBEDMBEDTLS-9673796
- published7 Apr 2025
- disclosed23 Mar 2025
- creditDaniel Stenberg
Introduced: 23 Mar 2025
NewCVE-2025-27809 (opens in a new tab)How to fix?
Upgrade armmbed/mbedtls to version 2.28.10, 3.6.3 or higher.
Overview
Affected versions of this package are vulnerable to Insecure Default Initialization of Resource when mbedtls_ssl_set_hostname() is not called by the client. Skipping this authentication step is the default behavior, and it enables an attacker to impersonate the server as long as they possess any valid certificate signed by a trusted CA.
Note: Under normal circumstances, the client must specify their target hostname twice - once when setting up a connection with mbedtls_net_connect(), and again when authenticating over that connection with mbedtls_ssl_set_hostname().