CVE-2019-18840

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-787

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

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

Timeline

Published: Nov 9, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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