What’s Vulnerable › Vulnerabilities

CVE-2017-11173

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-07-13 · updated 2026-06-17

Description

Missing anchor in generated regex for rack-cors before 0.4.1 allows a malicious third-party site to perform CORS requests. If the configuration were intended to allow only the trusted example.com domain name and not the malicious example.net domain name, then example.com.example.net (as well as example.com-example.net) would be inadvertently allowed.

Affected products

• Debian Linux: 9.0
• Rack-Cors Project Rack-Cors: before 0.4.1 — fixed in 0.4.1

How to fix

Upgrade to a fixed version: Rack-Cors Project Rack-Cors 0.4.1. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2017/Jul/22
• http://www.debian.org/security/2017/dsa-3931
• https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6
• https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.html
• http://seclists.org/fulldisclosure/2017/Jul/22
• http://www.debian.org/security/2017/dsa-3931
• https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6
• https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.html

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