CVE-2022-46393

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-15 · updated 2026-06-17
Weakness: CWE-125

Description

An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. There is a potential heap-based buffer overflow and heap-based buffer over-read in DTLS if MBEDTLS_SSL_DTLS_CONNECTION_ID is enabled and MBEDTLS_SSL_CID_IN_LEN_MAX > 2 * MBEDTLS_SSL_CID_OUT_LEN_MAX.

Affected products

mbedtls: before 2.28.2 — fixed in 2.28.2
Fedoraproject Fedora: 36, 37
TrustedFirmware Mbed TLS: from 3.0.0 before 3.3.0 — fixed in 3.3.0

How to fix

Upgrade to a fixed version: mbedtls 2.28.2; TrustedFirmware Mbed TLS 3.3.0. Check the vendor advisory for mitigations.

References

https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.2
https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.3.0
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BR7ZCVKLPGCOEEALUHZMFHXQHR6S4QL/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XMKJ5IMJEPXYAHHU56Z4P2FSYIEAESB/
https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/
https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.2
https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.3.0
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BR7ZCVKLPGCOEEALUHZMFHXQHR6S4QL/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XMKJ5IMJEPXYAHHU56Z4P2FSYIEAESB/
https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

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