CVE-2026-20028

{
  "id": "CVE-2026-20028",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-05T17:16:46.427",
  "lastModified": "2026-10-23T21:10:00.157",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the network driver of Cisco Terminal Service (TS) Agent could allow an authenticated, remote attacker to bypass firewall rules that are associated with the account of the attacker.\r\n\r\nThis vulnerability is due to an incorrect mapping of network connections to user accounts. An attacker with at least user-level credentials could exploit this vulnerability by sending crafted network traffic to an affected device. A successful exploit could allow the attacker to inherit the firewall rules associated with a different user in the system."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el controlador de red de Cisco Terminal Service (TS) Agent podría permitir a un atacante remoto y autenticado eludir las reglas del cortafuegos que están asociadas con la cuenta del atacante.\n\nEsta vulnerabilidad se debe a una asignación incorrecta de las conexiones de red a las cuentas de usuario. Un atacante con credenciales de al menos nivel de usuario podría explotar esta vulnerabilidad enviando tráfico de red manipulado a un dispositivo afectado. Un exploit exitoso podría permitir al atacante heredar las reglas del cortafuegos asociadas con un usuario diferente en el sistema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Cisco",
          "product": "Cisco Terminal Services Agent",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "TSAgent-1.3",
              "status": "affected"
            },
            {
              "version": "TSAgent-1.4.2",
              "status": "affected"
            },
            {
              "version": "TSAgent-1.2",
              "status": "affected"
            },
            {
              "version": "TSAgent-1.4",
              "status": "affected"
            },
            {
              "version": "TSAgent-1.0",
              "status": "affected"
            },
            {
              "version": "TSAgent-1.4.1",
              "status": "affected"
            },
            {
              "version": "TSAgent-1.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N",
          "baseScore": 5.0,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-05T17:19:39.672252Z",
          "id": "CVE-2026-20028",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-266"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ts-agent-fw-bypass-MYBTMrev",
      "source": "[email protected]"
    }
  ]
}