How severe is CVE-2022-35409?

This vulnerability has a severity rating of CRITICAL with a CVSS score of 9.1 out of 10.

What type of vulnerability is CVE-2022-35409?

This is classified as CWE-125, which is a common weakness in software security.

CVE-2022-35409 - CRITICAL Severity | CVSS 9.1

Vulnerability Description

An issue was discovered in Mbed TLS before 2.28.1 and 3.x before 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server that causes a heap-based buffer over-read of up to 255 bytes. This can cause a server crash or possibly information disclosure based on error responses. Affected configurations have MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled and MBEDTLS_SSL_IN_CONTENT_LEN less than a threshold that depends on the configuration: 258 bytes if using mbedtls_ssl_cookie_check, and possibly up to 571 bytes with a custom cookie check function.

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