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Critical

Security advisory

Type: advisorySources: OSVCVE: CVE-2019-12951

An issue was discovered in Mongoose before 6.15. The parse_mqtt() function in mg_mqtt.c has a critical heap-based buffer overflow.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2019-12951
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 12:28 UTC · Revision 1

Source evidence

CVE-2019-12951

core-osv · Original source

Published 24 Jun 2019, 23:15 UTC

An issue was discovered in Mongoose before 6.15. The parse_mqtt() function in mg_mqtt.c has a critical heap-based buffer overflow.

osv:CVE-2019-12951
Complete source record
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  "url": "https://osv.dev/vulnerability/CVE-2019-12951",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-12951",
    "summary": "An issue was discovered in Mongoose before 6.15. The parse_mqtt() function in mg_mqtt.c has a critical heap-based buffer overflow.",
    "evidence": "osv:CVE-2019-12951",
    "products": [],
    "severity": "critical",
    "structured": {
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      "aliases": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
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                }
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                    "cpe": "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*",
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                        "introduced": "0"
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                        "fixed": "6.15"
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                    "range": [
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                  {
                    "range": [
                      {
                        "fixed": "d5beb7ba3f3767891f3d85945d7d33c1d8596e37"
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                    "source": "REFERENCES_TAG",
                    "original_tag": "6.15"
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          "versions": [
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          "database_specific": {
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                "target": {
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            "vanir_signatures_modified": "2026-10-20T13:39:51Z"
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      ],
      "modified": "2026-10-20T13:39:51.000611209Z",
      "provider": "osv",
      "references": [
        "https://github.com/cesanta/mongoose/releases/tag/6.15",
        "https://github.com/cesanta/mongoose/commit/b3e0f780c34cea88f057a62213c012aa88fe2deb"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-12951",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387926,
  "published_at": "2019-06-24T23:15:12.21+00:00"
}