{"cve":"CVE-2015-1855","nvd":{"published":"2019-11-29T21:15:10.807","modified":"2026-06-17T00:23:07.280","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9},"cwes":["CWE-20"],"references":["http://www.debian.org/security/2015/dsa-3245","http://www.debian.org/security/2015/dsa-3246","http://www.debian.org/security/2015/dsa-3247","https://bugs.ruby-lang.org/issues/9644","https://puppetlabs.com/security/cve/cve-2015-1855"],"products":["debian:debian_linux","puppet:puppet_agent","puppet:puppet_enterprise","ruby-lang:ruby","ruby-lang:trunk"],"source":"nvd","synced_at":"2026-10-19T20:59:27.069234358+00:00"},"epss":{"cve":"CVE-2015-1855","score":0.02815,"percentile":0.86544,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}