Security advisory

{
  "id": "bbcdc5d4e7c71d3379004c55e37b8aaa832968aa3ee5a1d7c1de7fbd26fdefcd",
  "url": "https://osv.dev/vulnerability/CVE-2025-27810",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-27810",
    "summary": "Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses uninitialized stack memory to compose the TLS Finished message, potentially leading to authentication bypasses such as replays.",
    "evidence": "osv:CVE-2025-27810",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-27810",
      "aliases": [
        "CVE-2025-27810"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mbed-tls/mbedtls",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8df2f8e7b9c7bb9390ac74bb7bace27edca81a2b"
                },
                {
                  "fixed": "22098d41c6620ce07cf8a0134d37302355e1e5ef"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:trustedfirmware:mbed_tls:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "3.6.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-27810.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.186853570Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27810.json",
        "https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-2/",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-27810",
        "https://github.com/Mbed-TLS/mbedtls/releases"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-908"
        ],
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27810.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-27810",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518634,
  "published_at": "2025-03-25T00:00:00+00:00"
}