{"containers":{"cna":{"affected":[{"product":"puma","vendor":"puma","versions":[{"status":"affected","version":"< 4.3.8"},{"status":"affected","version":">= 5.0.0, < 5.3.1"}]}],"descriptions":[{"lang":"en","value":"Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was incomplete. The original fix only protected existing connections that had already been accepted from having their requests starved by greedy persistent-connections saturating all threads in the same process. However, new connections may still be starved by greedy persistent-connections saturating all threads in all processes in the cluster. A `puma` server which received more concurrent `keep-alive` connections than the server had threads in its threadpool would service only a subset of connections, denying service to the unserved connections. This problem has been fixed in `puma` 4.3.8 and 5.3.1. Setting `queue_requests false` also fixes the issue. This is not advised when using `puma` without a reverse proxy, such as `nginx` or `apache`, because you will open yourself to slow client attacks (e.g. slowloris). The fix is very small and a git patch is available for those using unsupported versions of Puma."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"{\"CWE-400\":\"Uncontrolled Resource Consumption\"}","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2022-08-27T20:06:19.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://github.com/puma/puma/security/advisories/GHSA-q28m-8xjw-8vr5"},{"tags":["x_refsource_MISC"],"url":"https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837"},{"tags":["x_refsource_MISC"],"url":"https://github.com/puma/puma/security/policy"},{"tags":["x_refsource_MISC"],"url":"https://rubygems.org/gems/puma"},{"name":"GLSA-202208-28","tags":["vendor-advisory","x_refsource_GENTOO"],"url":"https://security.gentoo.org/glsa/202208-28"},{"name":"[debian-lts-announce] 20220827 [SECURITY] [DLA 3083-1] puma security update","tags":["mailing-list","x_refsource_MLIST"],"url":"https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html"}],"source":{"advisory":"GHSA-q28m-8xjw-8vr5","discovery":"UNKNOWN"},"title":"Keepalive Connections Causing Denial Of Service in puma","x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-29509","STATE":"PUBLIC","TITLE":"Keepalive Connections Causing Denial Of Service in puma"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"puma","version":{"version_data":[{"version_value":"< 4.3.8"},{"version_value":">= 5.0.0, < 5.3.1"}]}}]},"vendor_name":"puma"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. 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