CVE-2022-35409
criticalpriority · track · 37EPSS 0.023 · 83 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.3–9.1
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (4)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (12)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2022-35409/cnnvd
- https://github.com/Mbed-TLS/mbedtls/releasescnnvd
- https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.2.0Patchcnnvd
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlcnnvd
- https://mbed-tls.readthedocs.io/en/latest/security-advisories/advisories/mbedtls-security-advisory-2022-07.htmlcnnvd
- https://vigilance.fr/vulnerability/Mbed-TLS-out-of-bounds-memory-reading-via-ClientHello-Message-40166cnnvd
- https://github.com/Mbed-TLS/mbedtls/releasesenisa_euvd
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlenisa_euvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan