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CVE-2018-8970

HighPublished

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...

Published: Mar 24, 2018
Updated: Aug 5, 2024
Assigning CNA: mitre
Evidence observed: Aug 5, 2026

Primary CVSS

7.4/ 10High

nvd · CVSS 3.0

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 59.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2018-8970PoC
Demo for https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8970

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