{"affected":[{"affectedData":[{"product":"symfony","vendor":"symfony","versions":[{"status":"affected","version":">= 4.4.0 and < 4.4.7"},{"status":"affected","version":">= 5.0.0 and < 5.0.7"}]}],"source":"security-advisories@github.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","matchCriteriaId":"95F04BAB-4B76-4142-B000-67FA0A9F73F4","versionEndExcluding":"4.4.7","versionStartIncluding":"4.4.0","vulnerable":true},{"criteria":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","matchCriteriaId":"A656BCAC-1974-4E5D-B7E3-4162A6153A4B","versionEndExcluding":"5.0.7","versionStartIncluding":"5.0.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"In Symfony before versions 4.4.7 and 5.0.7, when a `Response` does not contain a `Content-Type` header, affected versions of Symfony can fallback to the format defined in the `Accept` header of the request, leading to a possible mismatch between the response&#39;s content and `Content-Type` header. When the response is cached, this can prevent the use of the website by other users. This has been patched in versions 4.4.7 and 5.0.7."},{"lang":"es","value":"En Symfony en versiones anteriores a las versiones 4.4.7 y 5.0.7, cuando una \"Response\" no contiene un encabezado \"Content-Type\", las versiones afectadas de Symfony pueden retroceder al formato definido en el encabezado \"Accept\" de la petición, conllevando a una posible falta de coincidencia entre el contenido response's y el encabezado \"Content-Type\". Cuando la respuesta es almacenada en caché, esto puede impedir el uso del sitio web por otros usuarios. Esto ha sido parcheado en las versiones 4.4.7 y 5.0.7."}],"id":"CVE-2020-5255","lastModified":"2026-06-17T03:21:08.493","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"MEDIUM","cvssData":{"accessComplexity":"LOW","accessVector":"NETWORK","authentication":"SINGLE","availabilityImpact":"PARTIAL","baseScore":4.0,"confidentialityImpact":"NONE","integrityImpact":"NONE","vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:P","version":"2.0"},"exploitabilityScore":8.0,"impactScore":2.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":false}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":2.6,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"exploitabilityScore":1.2,"impactScore":1.4,"source":"security-advisories@github.com","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"exploitabilityScore":2.8,"impactScore":1.4,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2020-03-30T20:15:19.570","references":[{"source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"],"url":"https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859"},{"source":"security-advisories@github.com","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"url":"https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859"},{"source":"af854a3a-2127-422b-91ae-364da2661108","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header"}],"sourceIdentifier":"security-advisories@github.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-435"}],"source":"security-advisories@github.com","type":"Secondary"},{"description":[{"lang":"en","value":"CWE-20"}],"source":"nvd@nist.gov","type":"Primary"}]}