CVE-2017-11173

Name: CVE-2017-11173
Creator: NVD / NIST
Published: 2017-07-13T03:29:00.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.34%

Last modified Jun 17, 2026

CVE-2017-11173 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 2.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

2.34%

81.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Rack-Cors Project	Rack-Cors	< 0.4.1
Debian	Debian Linux	9.0

References

http://seclists.org/fulldisclosure/2017/Jul/22Mailing List, Third Party Advisory
http://www.debian.org/security/2017/dsa-3931Third Party Advisory
https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6Patch, Third Party Advisory
https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.htmlThird Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2017/Jul/22Mailing List, Third Party Advisory
http://www.debian.org/security/2017/dsa-3931Third Party Advisory
https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6Patch, Third Party Advisory
https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.htmlThird Party Advisory, VDB Entry

Timeline

Published: Jul 13, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-11173?

How severe is CVE-2017-11173?

CVE-2017-11173 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.34% probability of exploitation in the next 30 days.

How do I fix CVE-2017-11173?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-11173?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST