Vulnerability Details CVE-2019-18840
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 60.5%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References