{"api_version":"1","generated_at":"2026-04-23T01:31:35+00:00","cve":"CVE-2020-5249","urls":{"html":"https://cve.report/CVE-2020-5249","api":"https://cve.report/api/cve/CVE-2020-5249.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2020-5249","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-5249"},"summary":{"title":"CVE-2020-5249","description":"In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2020-03-02 16:15:00","updated_at":"2023-11-07 03:23:00"},"problem_types":["CWE-74"],"metrics":[],"references":[{"url":"https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v","name":"https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v","refsource":"MISC","tags":["Third Party Advisory"],"title":"HTTP Response Splitting · Advisory · puma/puma · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/","name":"FEDORA-2020-fd87f90634","refsource":"","tags":[],"title":"[SECURITY] Fedora 31 Update: rubygem-puma-3.12.4-1.fc31 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/","name":"FEDORA-2020-08092b4c97","refsource":"","tags":[],"title":"[SECURITY] Fedora 30 Update: rubygem-puma-3.12.4-1.fc30 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/","name":"FEDORA-2020-a3f26a9387","refsource":"","tags":[],"title":"[SECURITY] Fedora 32 Update: rubygem-puma-4.3.3-1.fc32 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/","name":"FEDORA-2020-08092b4c97","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 30 Update: rubygem-puma-3.12.4-1.fc30 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3","name":"https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"HTTP Injection - fix bug + 1 more vector (#2136) · puma/puma@c22712f · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58","name":"https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58","refsource":"CONFIRM","tags":["Third Party Advisory"],"title":"HTTP Response Splitting (Early Hints) · Advisory · puma/puma · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://owasp.org/www-community/attacks/HTTP_Response_Splitting","name":"https://owasp.org/www-community/attacks/HTTP_Response_Splitting","refsource":"MISC","tags":["Third Party Advisory"],"title":"HTTP Response Splitting Software Attack | OWASP Foundation","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/","name":"FEDORA-2020-a3f26a9387","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 32 Update: rubygem-puma-4.3.3-1.fc32 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/","name":"FEDORA-2020-fd87f90634","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 31 Update: rubygem-puma-3.12.4-1.fc31 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-5249","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5249","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2020","cve_id":"5249","vulnerable":"1","versionEndIncluding":"3.12.3","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"puma","cpe5":"puma","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"ruby","cpe12":"*","cpe13":"*"},{"cve_year":"2020","cve_id":"5249","vulnerable":"1","versionEndIncluding":"4.3.2","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"puma","cpe5":"puma","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"ruby","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2020-5249","qid":"750577","title":"OpenSUSE Security Update for rmt-server (openSUSE-SU-2020:2000-1)"},{"cve":"CVE-2020-5249","qid":"750580","title":"OpenSUSE Security Update for rmt-server (openSUSE-SU-2020:1993-1)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2020-5249","STATE":"PUBLIC","TITLE":"HTTP Response Splitting (Early Hints) in Puma"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Puma","version":{"version_data":[{"version_value":"< 3.12.4"},{"version_value":">= 4.0.0, < 4.3.3"}]}}]},"vendor_name":"puma"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')"}]}]},"references":{"reference_data":[{"name":"https://owasp.org/www-community/attacks/HTTP_Response_Splitting","refsource":"MISC","url":"https://owasp.org/www-community/attacks/HTTP_Response_Splitting"},{"name":"https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58","refsource":"CONFIRM","url":"https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58"},{"name":"https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v","refsource":"MISC","url":"https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v"},{"name":"https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3","refsource":"MISC","url":"https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3"},{"refsource":"FEDORA","name":"FEDORA-2020-a3f26a9387","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/"},{"refsource":"FEDORA","name":"FEDORA-2020-fd87f90634","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/"},{"refsource":"FEDORA","name":"FEDORA-2020-08092b4c97","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/"}]},"source":{"advisory":"GHSA-33vf-4xgg-9r58","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2020-03-02 16:15:00","lastModifiedDate":"2023-11-07 03:23:00","problem_types":["CWE-74"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:P/A:N","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"NONE","baseScore":4},"severity":"MEDIUM","exploitabilityScore":8,"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:puma:puma:*:*:*:*:*:ruby:*:*","versionStartIncluding":"4.0.0","versionEndIncluding":"4.3.2","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*","versionEndIncluding":"3.12.3","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2020","CveId":"5249","Ordinal":"165463","Title":"CVE-2020-5249","CVE":"CVE-2020-5249","Year":"2020"},"notes":[{"CveYear":"2020","CveId":"5249","Ordinal":"1","NoteData":"In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4.","Type":"Description","Title":null},{"CveYear":"2020","CveId":"5249","Ordinal":"2","NoteData":"2020-03-02","Type":"Other","Title":"Published"},{"CveYear":"2020","CveId":"5249","Ordinal":"3","NoteData":"2020-04-09","Type":"Other","Title":"Modified"}]}}}