{"cve":"CVE-2021-23409","nvd":{"published":"2021-07-21T07:15:07.547","modified":"2026-06-17T03:38:42.720","status":"Modified","description":"The package github.com/pires/go-proxyproto before 0.6.0 are vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":[],"references":["https://github.com/pires/go-proxyproto/issues/65","https://github.com/pires/go-proxyproto/pull/74","https://github.com/pires/go-proxyproto/pull/74/commits/cdc63867da24fc609b727231f682670d0d1cd346","https://github.com/pires/go-proxyproto/releases/tag/v0.6.0","https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439"],"products":["go-proxyproto_project:go-proxyproto"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-23409","score":0.01648,"percentile":0.76495,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xcf7-q56x-78gh","url":"https://osv.dev/vulnerability/GHSA-xcf7-q56x-78gh","summary":"github.com/pires/go-proxyproto vulnerable to DoS via Connection descriptor exhaustion","modified":"2026-09-10T03:49:15.401177543Z","packages":[{"ecosystem":"Go","name":"github.com/pires/go-proxyproto","purl":"pkg:golang/github.com/pires/go-proxyproto","ranges":["<0.6.1"],"fixed":["0.6.1"]}]},{"id":"GO-2022-0233","url":"https://osv.dev/vulnerability/GO-2022-0233","summary":"Resource exhaustion in github.com/pires/go-proxyproto","modified":"2026-03-13T22:10:56.050343Z","packages":[{"ecosystem":"Go","name":"github.com/pires/go-proxyproto","purl":"pkg:golang/github.com/pires/go-proxyproto","ranges":["<0.6.1"],"fixed":["0.6.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}