CVE-2019-18840

HIGH

wolfSSL <4.2.0c - Buffer Overflow

Title source: llm

Description

In wolfSSL 4.1.0 through 4.2.0c, there are missing sanity checks of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer overflow inside the DecodedCert structure in GetName in wolfcrypt/src/asn.c because the domain name location index is mishandled. Because a pointer is overwritten, there is an invalid free.

References (1)

[Exploit, Third Party Advisory] https://github.com/wolfSSL/wolfssl/issues/2555

Scores

CVSS v3 7.5

EPSS 0.0041

EPSS Percentile 61.4%

Attack Vector NETWORK

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

Details

CWE

CWE-787

Status published

Products (1)

wolfssl/wolfssl 4.1.0 - 4.2.0c

Published Nov 09, 2019

Tracked Since Feb 18, 2026