The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.

Related CVEs

CVE-2018-8970

Key Information

GHSA ID

GHSA-7gr4-mrjx-cjx9

Published

May 14, 2022 3:29 AM

Last Modified

May 14, 2022 3:29 AM

CVSS Score

7.5 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 28, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.