{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47865 exists.","fix":"No fix has been published for CVE-2021-47865 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-47865 is a high-severity denial of service vulnerability in ProFTPD, published on 21 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47865 and fix it if it is affected.\n\nWhat it is: CVE-2021-47865 is a high-severity denial of service vulnerability in ProFTPD, published on 21 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47865 exists.\n\nAffected product: ProFTPD. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2021-47865/ (Markdown: https://insights.sbomify.com/CVE-2021-47865/index.md)","id":"CVE-2021-47865","markdown":"https://insights.sbomify.com/CVE-2021-47865/index.md","name":"CVE-2021-47865","record":{"aliases":["GHSA-mf77-27mv-mhm4","UBUNTU-CVE-2021-47865"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"FTP server","requires_auth":"none","summary":"Attackers can cause denial of service in ProFTPD by exhausting connection limits through multiple simultaneous FTP connections.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"ProFTPD 1.3.7a contains a denial of service vulnerability that allows attackers to overwhelm the server by creating multiple simultaneous FTP connections. Attackers can repeatedly establish connections using threading to exhaust server connection limits and block legitimate user access.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"ProFTPD 1.3.7a - Remote Denial of Service","id":"CVE-2021-47865","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"WIN-PACK PRO 4.8 - 'GuardTourService' Unquoted Service Path","id":"CVE-2021-47866"},"packages":[],"prev":{"headline":"OSAS Traverse Extension 11 - 'travextensionhostsvc' Unquoted Service Path","id":"CVE-2021-47864"},"products":["ProFTPD"],"published":"2026-01-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-07","vendors":["ProFTPD"]},"summary":"Attackers can cause denial of service in ProFTPD by exhausting connection limits through multiple simultaneous FTP connections.","url":"https://insights.sbomify.com/CVE-2021-47865/"}