CVE-2023-6936 MEDIUM

CVE-2023-6936: Heap-buffer over-read with WOLFSSL_CALLBACKS

Vendor Wolfssl
Product wolfSSL
Published February 20, 2024
Last update March 26, 2025
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity None

CVSS vector

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

What the vulnerability does

01Description

In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).

Key dates

02Disclosure timeline

February 20, 2024 CVE published
March 26, 2025 Record updated