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Vulnerability record · CVE-2022-35409 · published 15 July 2022

CVE-2022-35409: Arm mbed tls out-of-bounds read vulnerability

Arm · Mbed Tls

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.

9.1 CVSS 3.1 Critical EPSS 2.2% · top 17.9% CWE-125 · Out-of-bounds read
9.1CVSS 3.1 base score
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Mbed-TLS/mbedtls/releases Release Notes
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html Mailing ListThird Party Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/advisories/mbedtls-security-advisory-2022-07.html ExploitMitigationVendor Advisory
https://github.com/Mbed-TLS/mbedtls/releases Release Notes
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html Mailing ListThird Party Advisory
https://mbed-tls.readthedocs.io/en/latest/security-advisories/advisories/mbedtls-security-advisory-2022-07.html ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-35409), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.