Vulnerability Description
Vapor is a web framework for Swift. In Vapor before version 4.40.1, there is a DoS attack against anyone who Bootstraps a metrics backend for their Vapor app. The following is the attack vector: 1. send unlimited requests against a vapor instance with different paths. this will create unlimited counters and timers, which will eventually drain the system. 2. downstream services might suffer from this attack as well by being spammed with error paths. This has been patched in 4.40.1. The `DefaultResponder` will rewrite any undefined route paths for to `vapor_route_undefined` to avoid unlimited counters.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vapor Project | Vapor | < 4.40.1 |
Related Weaknesses (CWE)
References
- https://github.com/vapor/vapor/commit/e3aa712508db2854ac0ab905696c65fd88fa7e23PatchThird Party Advisory
- https://github.com/vapor/vapor/releases/tag/4.40.1Release NotesThird Party Advisory
- https://github.com/vapor/vapor/security/advisories/GHSA-gcj9-jj38-hwmcThird Party Advisory
- https://vapor.codes/Product
- https://github.com/vapor/vapor/commit/e3aa712508db2854ac0ab905696c65fd88fa7e23PatchThird Party Advisory
- https://github.com/vapor/vapor/releases/tag/4.40.1Release NotesThird Party Advisory
- https://github.com/vapor/vapor/security/advisories/GHSA-gcj9-jj38-hwmcThird Party Advisory
- https://vapor.codes/Product
FAQ
What is CVE-2021-21328?
CVE-2021-21328 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Vapor is a web framework for Swift. In Vapor before version 4.40.1, there is a DoS attack against anyone who Bootstraps a metrics backend for their Vapor app. The following is the attack vector: 1. se...
How severe is CVE-2021-21328?
CVE-2021-21328 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21328?
Check the references section above for vendor advisories and patch information. Affected products include: Vapor Project Vapor.