{"api_version":"1","generated_at":"2026-07-24T01:40:11+00:00","cve":"CVE-2021-43794","urls":{"html":"https://cve.report/CVE-2021-43794","api":"https://cve.report/api/cve/CVE-2021-43794.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-43794","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-43794"},"summary":{"title":"CVE-2021-43794","description":"Discourse is an open source discussion platform. In affected versions an attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown a JSON blob instead of the HTML page. This can lead to a partial denial-of-service. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2021-12-01 20:15:00","updated_at":"2021-12-03 03:11:00"},"problem_types":["CWE-610"],"metrics":[],"references":[{"url":"https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1","name":"https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1","refsource":"MISC","tags":[],"title":"SECURITY: Disallow caching of MIME/Content-Type errors (#14939) · discourse/discourse@2da0001 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-249g-pc77-65hp","name":"https://github.com/discourse/discourse/security/advisories/GHSA-249g-pc77-65hp","refsource":"CONFIRM","tags":[],"title":"Anonymous user cache poisoning via development-mode header · Advisory · discourse/discourse · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43794","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43794","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"43794","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"discourse","cpe5":"discourse","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-43794","STATE":"PUBLIC","TITLE":"Anonymous user cache poisoning via development-mode header in Discourse"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"discourse","version":{"version_data":[{"version_value":"stable < 2.7.11"},{"version_value":"beta < 2.8.0.beta9"},{"version_value":"tests-passed < 2.8.0.beta9"}]}}]},"vendor_name":"discourse"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Discourse is an open source discussion platform. In affected versions an attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown a JSON blob instead of the HTML page. This can lead to a partial denial-of-service. This issue is patched in the latest stable, beta and tests-passed versions of Discourse."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-610: Externally Controlled Reference to a Resource in Another Sphere"}]}]},"references":{"reference_data":[{"name":"https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1","refsource":"MISC","url":"https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1"},{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-249g-pc77-65hp","refsource":"CONFIRM","url":"https://github.com/discourse/discourse/security/advisories/GHSA-249g-pc77-65hp"}]},"source":{"advisory":"GHSA-249g-pc77-65hp","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-12-01 20:15:00","lastModifiedDate":"2021-12-03 03:11:00","problem_types":["CWE-610"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM"},"exploitabilityScore":3.9,"impactScore":1.4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*","versionEndExcluding":"2.7.11","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"43794","Ordinal":"221354","Title":"CVE-2021-43794","CVE":"CVE-2021-43794","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"43794","Ordinal":"1","NoteData":"** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.","Type":"Description","Title":null}]}}}