Vulnerabilities > CVE-2019-18840 - Out-of-bounds Write vulnerability in Wolfssl 4.1.0/4.2.0/4.2.0C
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
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.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 3 |