VULNERABILITY INTELLIGENCE
CVE-2015-4020
CVSS score4.3 MEDIUM
EPSS probability3.46%
CISA KEVNot currently listed
Published2015-08-25
Last modified2026-06-17
CVSS vectorAV:N/AC:M/Au:N/C:N/I:P/A:N
Description
RubyGems 2.0.x before 2.0.17, 2.2.x before 2.2.5, and 2.4.x before 2.4.8 does not validate the hostname when fetching gems or making API requests, which allows remote attackers to redirect requests to arbitrary domains via a crafted DNS SRV record with a domain that is suffixed with the original domain name, aka a "DNS hijack attack." NOTE: this vulnerability exists because to an incomplete fix for CVE-2015-3900.
Weakness classification
- CWE-20: Improper Input Validation
Primary references
- cve@mitre.org — Vendor Advisory
- cve@mitre.org — Vendor Advisory
- cve@mitre.org — Third Party Advisory
- cve@mitre.org
- cve@mitre.org
- cve@mitre.org
- cve@mitre.org — Third Party Advisory
- cve@mitre.org — Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108