CVE-2026-103391

Full vulnerability record from the local CVENow database.

Description

An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.

Severity

MEDIUM

CVSS score

5.3 (v3.1)

Vulnerability status

Awaiting Analysis

Source identifier

[email protected]

Published

2026-10-28 17:17:22.163000

Last modified

2026-10-28 17:17:22.407000

View original CVE JSON

{
  "id": "CVE-2026-103391",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-28T17:17:22.163",
  "lastModified": "2026-10-28T17:17:22.407",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Juniper Networks",
          "product": "Session Smart Router",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "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",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://supportportal.juniper.net/JSA112183",
      "source": "[email protected]"
    }
  ]
}