CVE-2021-45936

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Source

https://cve.org/CVERecord?id=CVE-2021-45936

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-45936.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2021-45936

Published

2022-01-01T01:15:08.730Z

Modified

2026-07-09T00:38:18.883157Z

Severity

5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator

Summary

[none]

Details

wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttDecodeDisconnect (called from MqttClientDecodePacket and MqttClient_WaitType).

References

Affected packages

Git / github.com/wolfssl/wolfmqtt

Affected ranges

Type

GIT

Repo

https://github.com/wolfssl/wolfmqtt

Events

Introduced

74c09f7eb7934112cba2fe5a0b4956f2a01016af

Last affected

74c09f7eb7934112cba2fe5a0b4956f2a01016af

Fixed

84d4b53122e0fa0280c7872350b89d5777dabbb2

Database specific

{
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:wolfssl:wolfmqtt:1.9:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.9"
        },
        {
            "last_affected": "1.9"
        }
    ]
}

Affected versions

1.*

1.9

v1.*

v1.9

Database specific

vanir_signatures_modified

"2026-07-09T00:38:18Z"

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-45936.json"

vanir_signatures

[
    {
        "id": "CVE-2021-45936-3c4f0149",
        "digest": {
            "line_hashes": [
                "280277640168772996348933106240497287098",
                "120079499844175725862248008020683433689",
                "47346730709629407828913387344300580063",
                "79204163782737757014109719066411078623",
                "120803118586187991233588399328252326413"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "signature_type": "Line",
        "source": "https://github.com/wolfssl/wolfmqtt/commit/84d4b53122e0fa0280c7872350b89d5777dabbb2",
        "deprecated": false,
        "target": {
            "file": "src/mqtt_client.c"
        }
    },
    {
        "id": "CVE-2021-45936-7e8fea99",
        "digest": {
            "function_hash": "329802369575170683440296892229791015484",
            "length": 3755.0
        },
        "signature_version": "v1",
        "signature_type": "Function",
        "source": "https://github.com/wolfssl/wolfmqtt/commit/84d4b53122e0fa0280c7872350b89d5777dabbb2",
        "deprecated": false,
        "target": {
            "function": "MqttClient_WaitType",
            "file": "src/mqtt_client.c"
        }
    }
]