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High severity7.5NVD Advisory· Published Nov 9, 2019· Updated Jun 17, 2026

CVE-2019-18840

CVE-2019-18840

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.

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Affected products

2
  • WolfSSL/Wolfssl2 versions
    cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*range: >=4.1.0,<=4.2.0c
    • (no CPE)range: 4.1.0 - 4.2.0c

Patches

Vulnerability mechanics

References

1

News mentions

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