{"id":"CVE-2021-41036","aliases":["EUVD-2021-28189","GHSA-m9hg-v7xv-429h","UBUNTU-CVE-2021-41036"],"status":"published","title":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len...","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01214,"percentile":0.68952,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-11-02T23:15:09Z","modified":"2026-10-20T10:54:57Z","affected":[{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"paho.mqtt.c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.9-1","1.3.9-1build1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"paho.mqtt.c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.12-1","1.3.13-1","1.3.13-1build1","1.3.13-1build2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"paho.mqtt.c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.14-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"paho.mqtt.c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.15-1","1.3.16+ds-1","1.3.16+ds-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"paho.mqtt.c","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.14-2","1.3.15-1"]}],"products":[{"vendor":"eclipse","product":"paho_mqtt_c\\/c\\+\\+_client"},{"vendor":"the eclipse foundation","product":"eclipse paho mqtt c client"}],"references":[{"url":"https://github.com/eclipse/paho.mqtt.embedded-c/issues/96","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41036"},{"url":"https://github.com/advisories/GHSA-m9hg-v7xv-429h"},{"url":"https://ubuntu.com/security/CVE-2021-41036","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-41036","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-41036","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","status":"published","published":"2021-11-02T23:15:09Z","modified":"2024-08-04T02:59:31.302Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:32:59.105382Z"}],"euvd":[{"id":"EUVD-2021-28189","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","status":"published","published":"2021-11-02T23:15:09Z","modified":"2024-08-04T02:59:31Z","updated_at":"2026-11-03T03:24:19.242491Z"}],"ghsa":[{"id":"GHSA-m9hg-v7xv-429h","title":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len...","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","status":"published","published":"2022-05-24T19:19:38Z","modified":"2023-01-30T05:03:30Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:46:50.963031Z"}],"nvd":[{"id":"CVE-2021-41036","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","status":"published","published":"2021-11-03T00:15:08.023Z","modified":"2026-06-17T04:07:47.17Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:00.549994Z"}],"osv":[{"id":"CVE-2021-41036","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","status":"published","published":"2021-11-03T00:15:08.023Z","modified":"2026-10-20T10:54:57.470942336Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:21.249056Z"},{"id":"UBUNTU-CVE-2021-41036","description":"In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.","status":"published","published":"2021-11-03T00:15:00Z","modified":"2026-10-17T12:56:20.797244044Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:29.220315Z"}]}}