In wolfSSL through 4.1.0, there is a missing sanity check of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer over-read in CheckCertSignature_ex in wolfcrypt/src/asn.c.
{
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "4.1.0"
}
],
"source": "CPE_FIELD",
"cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*"
}