{"answers":{"affected":"3 open source packages ship an affected version, including github.com/pires/go-proxyproto. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-23409 in the wild and no public exploit code.","fix":"Upgrade github.com/pires/go-proxyproto to 0.6.1 or later.","what":"CVE-2021-23409 is a high-severity denial of service vulnerability in github.com/pires/go-proxyproto, published on 21 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-23409 and fix it if it is affected.\n\nWhat it is: CVE-2021-23409 is a high-severity denial of service vulnerability in github.com/pires/go-proxyproto, published on 21 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-23409 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/pires/go-proxyproto (Go): affected all versions; fixed in 0.6.1\n- github.com/pires/go-proxyproto (Go): affected all versions; fixed in 0.6.1\n- github.com/pires/go-proxyproto (Go): affected all versions; fixed in 0.6.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-23409/ (Markdown: https://insights.sbomify.com/CVE-2021-23409/index.md)","id":"CVE-2021-23409","markdown":"https://insights.sbomify.com/CVE-2021-23409/index.md","name":"CVE-2021-23409","record":{"aliases":["DEBIAN-CVE-2021-23409","GHSA-xcf7-q56x-78gh","GO-2022-0233","SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439","UBUNTU-CVE-2021-23409"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go proxy protocol library","requires_auth":"none","summary":"Attackers can cause denial of service in applications using the go-proxyproto library by establishing connections without the required proxy protocol header.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"go-proxyproto","vendor":"go-proxyproto_project"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"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.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Denial of Service (DoS)","id":"CVE-2021-23409","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":3,"n_references":5,"next":{"headline":"DO NOT USE THIS CANDIDATE NUMBER.","id":"CVE-2021-23410"},"packages":[{"ecosystem":"Go","fixed":["0.6.1"],"introduced":["0"],"last_affected":[],"package":"github.com/pires/go-proxyproto","purl":null,"source":"GHSA-xcf7-q56x-78gh"},{"ecosystem":"Go","fixed":["0.6.1"],"introduced":["0"],"last_affected":[],"package":"github.com/pires/go-proxyproto","purl":"pkg:golang/github.com/pires/go-proxyproto","source":"GHSA-xcf7-q56x-78gh"},{"ecosystem":"Go","fixed":["0.6.1"],"introduced":["0"],"last_affected":[],"package":"github.com/pires/go-proxyproto","purl":"pkg:golang/github.com/pires/go-proxyproto","source":"GO-2022-0233"}],"prev":{"headline":"Prototype Pollution","id":"CVE-2021-23408"},"products":["github.com/pires/go-proxyproto"],"published":"2021-07-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["n/a"]},"summary":"Attackers can cause denial of service in applications using the go-proxyproto library by establishing connections without the required proxy protocol header.","url":"https://insights.sbomify.com/CVE-2021-23409/"}