{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.3.3"
              },
              {
                "introduced": "4.4.3"
              },
              {
                "last_affected": "4.4.3"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0c27eb9faa76187e7aa6d8314f3cfc55bb2e766a"
            },
            {
              "introduced": "d95099f4c05b3c40cece93d8a261dd471e642086"
            },
            {
              "last_affected": "d95099f4c05b3c40cece93d8a261dd471e642086"
            }
          ],
          "repo": "https://github.com/siliconlabs/gecko_sdk",
          "type": "GIT"
        }
      ],
      "versions": [
        "4.4.3"
      ]
    },
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2024.6.1"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "aa5ce2e835dfdce8c20fb828f27d3a261946f946"
            }
          ],
          "repo": "https://github.com/siliconlabs/simplicity_sdk",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Silabs",
    "cwe_ids": [
      "CWE-667"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/1xxx/CVE-2025-1221.json"
  },
  "details": "A Zigbee Radio Co-Processor (RCP), which is using SiLabs EmberZNet Zigbee stack, was unable to send messages to the host system (CPCd) due to heavy Zigbee traffic, resulting in a Denial of Service (DoS) attack, Only hard reset will bring the device to normal operation",
  "id": "CVE-2025-1221",
  "modified": "2026-07-15T01:49:03.724123464Z",
  "published": "2025-07-30T08:09:19.214Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/1xxx/CVE-2025-1221.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-1221"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-7.4.4.0.pdf"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.0.2.0.pdf"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.silabs.com/documents/public/release-notes/emberznet-release-notes-8.1.0.0.pdf"
    },
    {
      "type": "REPORT",
      "url": "https://community.silabs.com/068Vm00000Sadyn"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SiliconLabs/gecko_sdk"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SiliconLabs/simplicity_sdk"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "DoS in Zigbee device due to heavy traffic"
}