CVE-2017-11173
Missing anchor in generated regex for rack-cors before 0.4.1 allows a malicious third-party site to perform CORS requests.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 2.34% probability · 84th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- rack-cors project/rack-cors · debian/debian linux
- Source
- cve@mitre.org
EPSS 2.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.