What’s Vulnerable › Vulnerabilities

CVE-2018-8970

• Severity: high (CVSS 7.4 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-03-24 · updated 2026-06-17
• Weakness: CWE-295

Description

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.

Affected products

• OpenBSD Libressl: 2.7.0

References

• https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff
• https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt
• https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42
• https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff
• https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt
• https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42

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