Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled

{
  "id": "17a4e374f8e16aeae2cf5069475daeb078cb0c1be5c4573f0b4938fa7234348a",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-103392",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled",
    "summary": "An Out-of-Bounds Write vulnerability in the TCP header processing in Juniper Networks Session Smart Router allows an attacker to corrupt TCP payload data and potentially cause session desynchronization via a transit TCP packet with an oversized SACK option length.",
    "evidence": "cve:CVE-2026-103392",
    "products": [
      {
        "name": {
          "value": "Session Smart Router",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-103392",
      "aliases": [
        "CVE-2026-103392"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 4.8,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
            "integrityImpact": "LOW",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "availabilityImpact": "LOW",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "Juniper Networks",
          "product": "Session Smart Router",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "7.0.5",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "7.1.0",
              "lessThan": "7.1.7",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "7.2.0",
              "lessThan": "7.2.3",
              "versionType": "custom"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-28T16:33:46.534Z",
      "provider": "cve",
      "references": [
        "https://supportportal.juniper.net/JSA112183"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
          "shortName": "juniper",
          "dateUpdated": "2026-10-28T16:33:46.534Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-103392",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 461072,
  "published_at": "2026-10-28T16:33:46.534+00:00"
}