CVE-2019-18840

HIGH

wolfSSL 4.1.0-4.2.0c - Heap-Based Buffer Overflow in ASN.1 Certificate Parsing

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)

Core 1

Core References

Exploit, Third Party Advisory x_refsource_misc

https://github.com/wolfSSL/wolfssl/issues/2555

Scores

CVSS v3 7.5

EPSS 0.0197

EPSS Percentile 78.1%

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