FKIE_CVE-2020-36178

Vulnerability from fkie_nvd - Published: 2021-01-06 21:15 - Updated: 2026-06-17 03:14
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
oal_ipt_addBridgeIsolationRules on TP-Link TL-WR840N 6_EU_0.9.1_4.16 devices allows OS command injection because a raw string entered from the web interface (an IP address field) is used directly for a call to the system library function (for iptables). NOTE: oal_ipt_addBridgeIsolationRules is not the only function that calls util_execSystem.
References
cve@mitre.orghttps://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.mdExploit, Third Party Advisory
cve@mitre.orghttps://therealunicornsecurity.github.io/TPLink/Exploit, Third Party Advisory
cve@mitre.orghttps://www.tp-link.com/fr/support/download/tl-wr840n/v6/#FirmwareVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/therealunicornsecurity/therealunicornsecurity.github.io/blob/master/_posts/2020-10-11-TPLink.mdExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://therealunicornsecurity.github.io/TPLink/Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.tp-link.com/fr/support/download/tl-wr840n/v6/#FirmwareVendor Advisory
Impacted products
Vendor Product Version
tp-link tl-wr840n_firmware 6_eu_0.9.1_4.16
tp-link tl-wr840n -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
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          "cpeMatch": [
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              "matchCriteriaId": "55DB5240-AABB-4179-AFDA-C090849ED6C9",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "oal_ipt_addBridgeIsolationRules on TP-Link TL-WR840N 6_EU_0.9.1_4.16 devices allows OS command injection because a raw string entered from the web interface (an IP address field) is used directly for a call to the system library function (for iptables). NOTE: oal_ipt_addBridgeIsolationRules is not the only function that calls util_execSystem."
    },
    {
      "lang": "es",
      "value": "oal_ipt_addBridgeIsolationRules en dispositivos TP-Link TL-WR840N versi\u00f3n 6_EU_0.9.1_4.16, permite una inyecci\u00f3n de comandos del Sistema Operativo porque una cadena sin procesar ingresada desde la interfaz web (un campo de direcci\u00f3n IP) es usada directamente para una llamada a la funci\u00f3n de biblioteca del sistema (para iptables)"
    }
  ],
  "id": "CVE-2020-36178",
  "lastModified": "2026-06-17T03:14:54.610",
  "metrics": {
    "cvssMetricV2": [
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        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
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          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 10.0,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
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        "exploitabilityScore": 10.0,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
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    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  },
  "published": "2021-01-06T21:15:14.317",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
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        "Third Party Advisory"
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    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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