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CVE-2019-0858

Status: ModifiedMedium (6.1)—

A spoofing vulnerability exists in Microsoft Exchange Server when Outlook Web Access (OWA) fails to properly handle web requests, aka 'Microsoft Exchange Spoofing Vulnerability'. This CVE ID is unique from CVE-2019-0817.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Microsoft — Exchange Server

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2019-0858",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server",
          "versions": [
            {
              "status": "affected",
              "version": "2019"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server 2016",
          "versions": [
            {
              "status": "affected",
              "version": "Cumulative Update 11"
            },
            {
              "status": "affected",
              "version": "Cumulative Update 12"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server 2013",
          "versions": [
            {
              "status": "affected",
              "version": "Cumulative Update 22"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Exchange Server 2019",
          "versions": [
            {
              "status": "affected",
              "version": "Cumulative Update 1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-04-09T21:29:02.473",
  "references": [
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0858",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0858",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A spoofing vulnerability exists in Microsoft Exchange Server when Outlook Web Access (OWA) fails to properly handle web requests, aka 'Microsoft Exchange Spoofing Vulnerability'. This CVE ID is unique from CVE-2019-0817."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad de suplantación en Microsoft Exchange Server cuando Outlook Web Access (OWA) no maneja adecuadamente las peticiones web, también se conoce como \"Microsoft Exchange Spoofing Vulnerability\". Este ID de CVE es diferente del CVE-2019-0817."
    }
  ],
  "lastModified": "2026-06-17T02:09:03.200",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "751FD35F-2ECD-4B75-9589-988CC6AD3058"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9BE04790-85A2-4078-88CE-1787BC5172E7"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CCF101BE-27FD-4E2D-A694-C606BD3D1ED7"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "40D8A6DB-9225-4A3F-AD76-192F6CCCF002"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "051DE6C4-7456-4C42-BC51-253208AADB4E"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}