VULNERABILITY INTELLIGENCE

CVE-2015-1855

CVSS score5.9 MEDIUM
EPSS probability2.81%
CISA KEVNot currently listed
Published2019-11-29
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Description

verify_certificate_identity in the OpenSSL extension in Ruby before 2.0.0 patchlevel 645, 2.1.x before 2.1.6, and 2.2.x before 2.2.2 does not properly validate hostnames, which allows remote attackers to spoof servers via vectors related to (1) multiple wildcards, (1) wildcards in IDNA names, (3) case sensitivity, and (4) non-ASCII characters.

Weakness classification

  • CWE-20: Improper Input Validation

Primary references