FKIE_CVE-2017-20190

Vulnerability from fkie_nvd - Published: 2024-03-27 00:15 - Updated: 2026-06-17 01:15
Severity
Summary
Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a "Zalgo text" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability.
References
cve@mitre.orghttps://aka.ms/windowsbugbar
cve@mitre.orghttps://en.wikipedia.org/wiki/Zalgo_text
cve@mitre.orghttps://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234
af854a3a-2127-422b-91ae-364da2661108https://aka.ms/windowsbugbar
af854a3a-2127-422b-91ae-364da2661108https://en.wikipedia.org/wiki/Zalgo_text
af854a3a-2127-422b-91ae-364da2661108https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unknown",
          "product": "windows",
          "vendor": "microsoft",
          "versions": [
            {
              "lessThanOrEqual": "11",
              "status": "affected",
              "version": "8",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "cveTags": [
    {
      "sourceIdentifier": "cve@mitre.org",
      "tags": [
        "disputed"
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Some Microsoft technologies as used in Windows 8 through 11 allow a temporary client-side performance degradation during processing of multiple Unicode combining characters, aka a \"Zalgo text\" attack. NOTE: third parties dispute whether the computational cost of interpreting Unicode data should be considered a vulnerability."
    },
    {
      "lang": "es",
      "value": "Algunas tecnolog\u00edas de Microsoft utilizadas en Windows 8 a 11 permiten una degradaci\u00f3n temporal del rendimiento del lado del cliente durante el procesamiento de m\u00faltiples caracteres combinados Unicode, tambi\u00e9n conocido como ataque de \"texto Zalgo\". NOTA: los terceros cuestionan si el costo computacional de interpretar los datos Unicode debe considerarse una vulnerabilidad."
    }
  ],
  "id": "CVE-2017-20190",
  "lastModified": "2026-06-17T01:15:22.267",
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2017-20190",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-04-15T16:50:02.920361Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-03-27T00:15:07.580",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://aka.ms/windowsbugbar"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://en.wikipedia.org/wiki/Zalgo_text"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://aka.ms/windowsbugbar"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://en.wikipedia.org/wiki/Zalgo_text"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://talk.dynalist.io/t/dynalist-is-vulnerable-to-zalgo/1234"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-176"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.