{
  "cveId": "CVE-2025-64763",
  "url": "https://patchblox.com/security/cve/CVE-2025-64763",
  "summary": "CVE-2025-64763 is fixed in ecs-service-connect-agent on 1 platform by ALAS2023-2025-1357 (version v1.34.4.2-1.amzn2023), released January 7, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ecs-service-connect-agent: Envoy is a high-performance edge/middle/service proxy",
  "description": "Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, when Envoy is configured in TCP proxy mode to handle CONNECT requests, it accepts client data before issuing a 2xx response and forwards that data to the upstream TCP connection. If a forwarding proxy upstream from Envoy then responds with a non-2xx status, this can cause a de-synchronized CONNECT tunnel state. By default Envoy continues to allow early CONNECT data to avoid disrupting existing deployments. The envoy.reloadable_features.reject_early_connect_data runtime flag can be set to reject CONNECT requests that send data before a 2xx response when intermediaries upstream from Envoy may reject establishment of a CONNECT tunnel.",
  "published": "2026-01-07T18:41:00Z",
  "severity": "important",
  "epss": 0.00323,
  "epssPercentile": 0.2567,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ecs-service-connect-agent",
      "release": "amzn 2023",
      "fixedVersion": "v1.34.4.2-1.amzn2023",
      "fix": "ALAS2023-2025-1357",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1357",
      "released": "2026-01-07T18:41:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}