Out of Bounds Write in FreeRTOS-Plus-TCP

{
  "id": "6eb42d1648b93a677ba9eb5cf31dcf13fbf3f91742baf9ef2e56d9adec1512dd",
  "url": "https://osv.dev/vulnerability/CVE-2025-5688",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Out of Bounds Write in FreeRTOS-Plus-TCP",
    "summary": "We have identified a buffer overflow issue allowing out-of-bounds write when processing LLMNR or mDNS queries with very long DNS names. This issue only affects systems using Buffer Allocation Scheme 1 with LLMNR or mDNS enabled. Users should upgrade to the latest version and ensure any forked or derivative code is patched to incorporate the new fixes.",
    "evidence": "osv:CVE-2025-5688",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-5688",
      "aliases": [
        "CVE-2025-5688",
        "GHSA-5x4f-fvv8-wr65"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/freertos/freertos-plus-tcp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "de36c605a89a40d81c385dfcd0e8f6bf4017eb0e"
                },
                {
                  "fixed": "21c0438b73c7a22f8c7b08d0ff5ac8a5e1e21a97"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.3.4"
                      },
                      {
                        "fixed": "4.3.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "21c0438b73c7a22f8c7b08d0ff5ac8a5e1e21a97"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "V4.3.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "V4.3.1",
            "V4.0.0-appsec",
            "V2.4.0",
            "V2.3.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-5688.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.589186126Z",
      "provider": "osv",
      "references": [
        "https://aws.amazon.com/security/security-bulletins/AWS-2025-012/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/5xxx/CVE-2025-5688.json",
        "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-5x4f-fvv8-wr65",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-5688",
        "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.3.2",
        "https://github.com/FreeRTOS/FreeRTOS-Plus-TCP"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "AMZN",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/5xxx/CVE-2025-5688.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-5688",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508990,
  "published_at": "2025-06-04T17:09:54.718+00:00"
}