{"affected":[{"affectedData":[{"cpes":["cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*"],"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2019 Cumulative Update 7","vendor":"Microsoft","versions":[{"lessThan":"publication","status":"affected","version":"15.02.0","versionType":"custom"}]},{"cpes":["cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*"],"platforms":["x64-based Systems"],"product":"Microsoft Exchange Server 2016 Cumulative Update 18","vendor":"Microsoft","versions":[{"lessThan":"publication","status":"affected","version":"15.01.0","versionType":"custom"}]}],"source":"secure@microsoft.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*","matchCriteriaId":"29805EC7-6403-44B9-91EC-109C087E98EB","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*","matchCriteriaId":"36CE5C6D-9A04-41F5-AE7C-265779833649","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"<p>A spoofing vulnerability exists in Microsoft Exchange Server which could result in an attack that would allow a malicious actor to impersonate the user.</p>\n<p>This update addresses this vulnerability.</p>\n<p>To prevent these types of attacks, Microsoft recommends customers to download inline images from different DNSdomains than the rest of OWA. Please see further instructions in the FAQ to put in place this mitigations.</p>"},{"lang":"es","value":"Una Vulnerabilidad de Suplantación de Identidad de Microsoft Exchange Server. Este ID de CVE es diferente de CVE-2021-24085"}],"id":"CVE-2021-1730","lastModified":"2026-06-17T03:32:27.357","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"MEDIUM","cvssData":{"accessComplexity":"MEDIUM","accessVector":"NETWORK","authentication":"NONE","availabilityImpact":"NONE","baseScore":5.8,"confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","version":"2.0"},"exploitabilityScore":8.6,"impactScore":4.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":true}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"exploitabilityScore":2.8,"impactScore":2.5,"source":"secure@microsoft.com","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"exploitabilityScore":2.8,"impactScore":2.5,"source":"nvd@nist.gov","type":"Secondary"}]},"published":"2021-02-25T23:15:13.790","references":[{"source":"secure@microsoft.com","tags":["Patch","Vendor Advisory"],"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1730"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Vendor Advisory"],"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1730"}],"sourceIdentifier":"secure@microsoft.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"NVD-CWE-noinfo"}],"source":"nvd@nist.gov","type":"Primary"}]}