{"id":"CVE-2021-45939","aliases":["EUVD-2021-32648","GHSA-jc37-rmrx-qcxg"],"status":"published","title":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from...","description":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Subscribe).","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00921,"percentile":0.60613,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2021-12-31T23:57:33Z","modified":"2026-10-20T14:10:59Z","products":[{"vendor":"wolfssl","product":"wolfmqtt"}],"references":[{"url":"https://github.com/wolfSSL/wolfMQTT/commit/84d4b53122e0fa0280c7872350b89d5777dabbb2","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/google/oss-fuzz-vulns/blob/main/vulns/wolfmqtt/OSV-2021-1361.yaml","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39103","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-45939"},{"url":"https://github.com/advisories/GHSA-jc37-rmrx-qcxg"}],"sources":{"cve":[{"id":"CVE-2021-45939","description":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Subscribe).","status":"published","published":"2021-12-31T23:57:33Z","modified":"2024-08-04T04:54:31.116Z","updated_at":"2026-11-02T14:33:02.930115Z"}],"euvd":[{"id":"EUVD-2021-32648","description":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Subscribe).","status":"published","published":"2021-12-31T23:57:33Z","modified":"2024-08-04T04:54:31Z","updated_at":"2026-11-03T03:08:25.222984Z"}],"ghsa":[{"id":"GHSA-jc37-rmrx-qcxg","title":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from...","description":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Subscribe).","status":"published","published":"2022-01-02T00:00:48Z","modified":"2023-02-03T05:03:39Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:53:24.247018Z"}],"nvd":[{"id":"CVE-2021-45939","description":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Subscribe).","status":"published","published":"2022-01-01T01:15:08.887Z","modified":"2026-06-17T04:14:17.21Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:02.977492Z"}],"osv":[{"id":"CVE-2021-45939","description":"wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Subscribe).","status":"published","published":"2022-01-01T01:15:08.887Z","modified":"2026-10-20T14:10:59.483940331Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:22.18434Z"}]}}