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CVE-2015-4020 is a low severity vulnerability with a CVSS score of 0.0. No known exploits currently, and patches are available.
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Lower probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
RubyGems 2.0.x before 2.0.17, 2.2.x before 2.2.5, and 2.3.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 of an incomplete fix for CVE-2015-3900.
| Vendor | Product |
|---|---|
| Rubygems | Rubygems |
| Oracle | Solaris |