Vulnerability Details CVE-2021-21328
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 62.4%
CVSS Severity
CVSS v3 Score 5.3
CVSS v2 Score 5.0
References
- https://github.com/vapor/vapor/commit/e3aa712508db2854ac0ab905696c65fd88fa7e23
- https://github.com/vapor/vapor/releases/tag/4.40.1
- https://github.com/vapor/vapor/security/advisories/GHSA-gcj9-jj38-hwmc
- https://vapor.codes/
- https://github.com/vapor/vapor/commit/e3aa712508db2854ac0ab905696c65fd88fa7e23
- https://github.com/vapor/vapor/releases/tag/4.40.1
- https://github.com/vapor/vapor/security/advisories/GHSA-gcj9-jj38-hwmc
- https://vapor.codes/
Products affected by CVE-2021-21328
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cpe:2.3:a:vapor_project:vapor:4.29.4