{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-28166 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-28166 is a medium-severity vulnerability in The Eclipse Foundation Eclipse Mosquitto, published on 7 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-28166 and fix it if it is affected.\n\nWhat it is: CVE-2021-28166 is a medium-severity vulnerability in The Eclipse Foundation Eclipse Mosquitto, published on 7 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-28166 in the wild and no public exploit code.\n\nAffected product: The Eclipse Foundation Eclipse Mosquitto. 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-2021-28166/ (Markdown: https://insights.sbomify.com/CVE-2021-28166/index.md)","id":"CVE-2021-28166","markdown":"https://insights.sbomify.com/CVE-2021-28166/index.md","name":"CVE-2021-28166","record":{"aliases":["ALPINE-CVE-2021-28166","DEBIAN-CVE-2021-28166","GHSA-3647-h3m7-326w"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"MQTT broker","requires_auth":"low_privilege","summary":"An authenticated client can cause a denial of service in the Eclipse Mosquitto MQTT broker by sending a crafted CONNACK message.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"eclipse","cpe":[{"product":"mosquitto","vendor":"eclipse"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.","ecosystems":[],"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":"Null dereference in Eclipse Mosquitto","id":"CVE-2021-28166","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Information disclosure in Eclipse OpenJ9","id":"CVE-2021-28167"},"packages":[],"prev":{"headline":"Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources","id":"CVE-2021-28165"},"products":["Eclipse Mosquitto"],"published":"2021-04-07","related":[{"cvss_score":8.1,"headline":"Auth bypass in Eclipse Mosquitto","id":"CVE-2018-12550","kev_date_added":null,"published":"2019-03-27"},{"cvss_score":8.1,"headline":"Auth bypass in Eclipse Mosquitto","id":"CVE-2018-12551","kev_date_added":null,"published":"2019-03-27"},{"cvss_score":7.5,"headline":"Unconditionally adding an event to the epoll causes excessive CPU consumption","id":"CVE-2023-5632","kev_date_added":null,"published":"2023-10-18"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-28366","kev_date_added":null,"published":"2023-09-01"},{"cvss_score":7.5,"headline":"Denial of service in Eclipse Mosquitto","id":"CVE-2021-41039","kev_date_added":null,"published":"2021-12-01"},{"cvss_score":7.5,"headline":"Denial of service in Eclipse Mosquitto","id":"CVE-2021-34432","kev_date_added":null,"published":"2021-07-27"},{"cvss_score":7.5,"headline":"Missing authorization in n/a","id":"CVE-2018-20145","kev_date_added":null,"published":"2018-12-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["The Eclipse Foundation"]},"summary":"An authenticated client can cause a denial of service in the Eclipse Mosquitto MQTT broker by sending a crafted CONNACK message.","url":"https://insights.sbomify.com/CVE-2021-28166/"}