CVE-2018-8970

Name: CVE-2018-8970
Creator: NVD / NIST
Published: 2018-03-24T21:29:00.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.06%

Last modified Jun 17, 2026

CVE-2018-8970 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.06%

60.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Openbsd	Libressl	2.7.0

References

https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cffThird Party Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txtVendor Advisory
https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42Patch, Third Party Advisory
https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cffThird Party Advisory
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txtVendor Advisory
https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42Patch, Third Party Advisory

Timeline

Published: Mar 24, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-8970?

How severe is CVE-2018-8970?

Severity scoring for CVE-2018-8970 is pending analysis. The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2018-8970?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-8970?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST