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.
CVSS Details
- CVSS 3.1 Base Score: 9.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade mbedtlsUpgrade mbedtls2Upgrade mbedtls3 | Aug 22, 2024 | Jul 15, 2022 |
| Debian | — | Upgrade mbedtls | Dec 28, 2022 | Jul 15, 2022 |
| Gentoo Linux | — | Upgrade net-libs/mbedtls. | Jan 12, 2023 | Jul 15, 2022 |
| Suse | — | Upgrade libmbedtls12Upgrade libmbedtls12-32bitUpgrade libmbedcrypto3-64bitUpgrade libmbedcrypto3-32bitUpgrade libmbedx509-0Upgrade libmbedcrypto3Upgrade libmbedtls12-64bitUpgrade mbedtls-develUpgrade libmbedx509-0-64bitUpgrade libmbedx509-0-32bit | Dec 23, 2022 | Jul 15, 2022 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Jul 15, 2022 |
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