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Medium

Forged packets over MQTT can show up in direct messages in Meshtastic firmware

Type: advisorySources: OSV

Meshtastic is an open source mesh networking solution. In affected firmware versions crafted packets over MQTT are able to appear as a DM in client to a node even though they were not decoded with PKC. This issue has been addressed in version 2.5.19 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2025-21608
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 03:13 UTC · Revision 1

Source evidence

Forged packets over MQTT can show up in direct messages in Meshtastic firmware

core-osv · Original source

Published 18 Feb 2025, 18:17 UTC

Meshtastic is an open source mesh networking solution. In affected firmware versions crafted packets over MQTT are able to appear as a DM in client to a node even though they were not decoded with PKC. This issue has been addressed in version 2.5.19 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

osv:CVE-2025-21608
Complete source record
{
  "id": "16de40866eb26905599bcff18025728cb80a8202547098b08f753f116d4921da",
  "url": "https://osv.dev/vulnerability/CVE-2025-21608",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Forged packets over MQTT can show up in direct messages in Meshtastic firmware",
    "summary": "Meshtastic is an open source mesh networking solution. In affected firmware versions crafted packets over MQTT are able to appear as a DM in client to a node even though they were not decoded with PKC. This issue has been addressed in version 2.5.19 and all users are advised to upgrade. There are no known workarounds for this vulnerability.",
    "evidence": "osv:CVE-2025-21608",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-21608",
      "aliases": [
        "CVE-2025-21608",
        "GHSA-c967-qc39-3hf5"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/meshtastic/firmware",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "89ebafc8b8d85ee12002b9c574f8472d99e9ec50"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.5.0"
                      },
                      {
                        "last_affected": "2.5.18"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  }
                ]
              }
            }
          ],
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21608.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.843098555Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21608.json",
        "https://github.com/meshtastic/firmware/security/advisories/GHSA-c967-qc39-3hf5",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21608"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-668"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21608.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21608",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499951,
  "published_at": "2025-02-18T18:17:28.752+00:00"
}