CVE-2015-4020
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.
- EPSS
- 3.5% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
- CWE
- CWE-20
- Published
- Modified
- Record from
- the NVD, synced
Affected
- oracle:solaris
- rubygems:rubygems
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-qv62-xfj6-32xm | RubyGems | rubygems-update | <2.0.17 | 2.0.17 |
| GHSA-qv62-xfj6-32xm | RubyGems | rubygems-update | >=2.1.0.rc.1 <2.2.5 | 2.2.5 |
| GHSA-qv62-xfj6-32xm | RubyGems | rubygems-update | >=2.3.0 <2.4.8 | 2.4.8 |