{"answers":{"affected":"2 open source packages ship an affected version, including github.com/pires/go-proxyproto. It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-23351 in the wild and no public exploit code.","fix":"Upgrade github.com/pires/go-proxyproto to 0.5.0 or later.","what":"CVE-2021-23351 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 8 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-23351 and fix it if it is affected.\n\nWhat it is: CVE-2021-23351 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 8 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-23351 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 0.5.0\n- github.com/pires/go-proxyproto (Go): affected all versions; fixed in 0.5.0\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-2021-23351/ (Markdown: https://insights.sbomify.com/CVE-2021-23351/index.md)","id":"CVE-2021-23351","markdown":"https://insights.sbomify.com/CVE-2021-23351/index.md","name":"CVE-2021-23351","record":{"aliases":["DEBIAN-CVE-2021-23351","GHSA-fqh4-rh59-xhvf","SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1081577","UBUNTU-CVE-2021-23351"],"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":"high_privilege","summary":"An attacker can cause a denial of service by sending malformed proxy protocol headers that exhaust memory in applications using this Go library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"go-proxyproto","vendor":"go-proxyproto_project"}],"cvss":{"score":4.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"The package github.com/pires/go-proxyproto before 0.5.0 are vulnerable to Denial of Service (DoS) via the parseVersion1() function. The reader in this package is a default bufio.Reader wrapping a net.Conn. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers.","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-2021-23351","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"fedoraproject:fedora","products":["fedoraproject:fedora"],"type":"denial_of_service","year":"2021"},"n_packages":2,"n_references":6,"next":{"headline":"Command Injection","id":"CVE-2021-23352"},"packages":[{"ecosystem":"Go","fixed":["0.5.0"],"introduced":["0"],"last_affected":[],"package":"github.com/pires/go-proxyproto","purl":null,"source":"GHSA-fqh4-rh59-xhvf"},{"ecosystem":"Go","fixed":["0.5.0"],"introduced":["0"],"last_affected":[],"package":"github.com/pires/go-proxyproto","purl":"pkg:golang/github.com/pires/go-proxyproto","source":"GHSA-fqh4-rh59-xhvf"}],"prev":{"headline":"Arbitrary Command Injection","id":"CVE-2021-23348"},"products":["github.com/pires/go-proxyproto"],"published":"2021-03-08","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"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":"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":"2024-09-17","vendors":["n/a"]},"summary":"An attacker can cause a denial of service by sending malformed proxy protocol headers that exhaust memory in applications using this Go library.","url":"https://insights.sbomify.com/CVE-2021-23351/"}