CVE-2015-1777: Red Hat Rhn-Client-Tools

Medium severity, CVSS 5.9. EPSS: 1.2% chance of exploitation in the next 30 days.

rhnreg_ks in Red Hat Network Client Tools (aka rhn-client-tools) on Red Hat Gluster Storage 2.1 and Enterprise Linux (RHEL) 5, 6, and 7 does not properly validate hostnames in X.509 certificates from SSL servers, which allows remote attackers to prevent system registration via a man-in-the-middle attack.

Affected products

• Red Hat Rhn-Client-Tools: any version

Published 2018-04-12. Last modified 2026-06-17.