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This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely."}, {"lang": "es", "value": "En Apache Tomcat versiones 9.0.0.M1 hasta 9.0.30, versiones 8.5.0 hasta 8.5.50 y versiones 7.0.0 hasta 7.0.99, el c\u00f3digo de an\u00e1lisis del encabezado HTTP utiliz\u00f3 un enfoque para el an\u00e1lisis de fin de l\u00ednea que permiti\u00f3 a algunos encabezados HTTP no v\u00e1lidos ser analizados como v\u00e1lidos. Esto conllev\u00f3 a una posibilidad de Tr\u00e1fico No Autorizado de Peticiones HTTP si Tomcat se encontraba detr\u00e1s de un proxy inverso que manejaba incorrectamente el encabezado Transfer-Encoding no v\u00e1lido en una manera particular. Tal proxy inverso es considerado improbable."}], "id": "CVE-2020-1935", "lastModified": "2026-06-17T03:02:38.710", "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": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": 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"af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2020/dsa-4673"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2020/dsa-4680"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpujan2021.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpujul2020.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.oracle.com/security-alerts/cpuoct2020.html"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank @ZeddYu (Apache Tomcat Security Team) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2020:5020", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "tomcat-0:7.0.76-16.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-11-10T00:00:00Z"}, {"advisory": "RHSA-2021:0882", "cpe": "cpe:/o:redhat:rhel_eus:7.6", "package": "tomcat-0:7.0.76-11.el7_6", "product_name": "Red Hat Enterprise Linux 7.6 Extended Update Support", "release_date": "2021-03-16T00:00:00Z"}, {"advisory": "RHSA-2021:1030", "cpe": "cpe:/o:redhat:rhel_eus:7.7", "package": "tomcat-0:7.0.76-12.el7_7", "product_name": "Red Hat Enterprise Linux 7.7 Extended Update Support", "release_date": "2021-03-30T00:00:00Z"}, {"advisory": "RHSA-2020:4847", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "pki-core:10.6-8030020200911215836.5ff1562f", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-04T00:00:00Z"}, {"advisory": "RHSA-2020:4847", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "pki-deps:10.6-8030020200527165326.30b713e6", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-11-04T00:00:00Z"}, {"advisory": "RHSA-2021:3140", "cpe": "cpe:/a:redhat:jboss_fuse:7", "package": "tomcat", "product_name": "Red Hat Fuse 7.9", "release_date": "2021-08-11T00:00:00Z"}, {"advisory": "RHSA-2020:3305", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1", "package": "tomcat", "product_name": "Red Hat JBoss Web Server 3.1", "release_date": "2020-08-04T00:00:00Z"}, {"advisory": "RHSA-2020:3303", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1::el6", "package": "tomcat7-0:7.0.70-41.ep7.el6", "product_name": "Red Hat JBoss Web Server 3 for RHEL 6", "release_date": "2020-08-04T00:00:00Z"}, {"advisory": "RHSA-2020:3303", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1::el6", "package": "tomcat8-0:8.0.36-45.ep7.el6", "product_name": "Red Hat JBoss Web Server 3 for RHEL 6", "release_date": "2020-08-04T00:00:00Z"}, {"advisory": "RHSA-2020:3303", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1::el7", "package": "tomcat7-0:7.0.70-41.ep7.el7", "product_name": "Red Hat JBoss Web Server 3 for RHEL 7", "release_date": "2020-08-04T00:00:00Z"}, {"advisory": "RHSA-2020:3303", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3.1::el7", "package": "tomcat8-0:8.0.36-45.ep7.el7", "product_name": "Red Hat JBoss Web Server 3 for RHEL 7", "release_date": "2020-08-04T00:00:00Z"}, {"advisory": "RHSA-2020:1520", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3::el6", "package": "jws5-tomcat-0:9.0.30-3.redhat_4.1.el6jws", "product_name": "Red Hat JBoss Web Server 5.3 on RHEL 6", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:1520", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3::el6", "package": "jws5-tomcat-native-0:1.2.23-4.redhat_4.el6jws", "product_name": "Red Hat JBoss Web Server 5.3 on RHEL 6", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:1520", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3::el7", "package": "jws5-tomcat-0:9.0.30-3.redhat_4.1.el7jws", "product_name": "Red Hat JBoss Web Server 5.3 on RHEL 7", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:1520", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3::el7", "package": "jws5-tomcat-native-0:1.2.23-4.redhat_4.el7jws", "product_name": "Red Hat JBoss Web Server 5.3 on RHEL 7", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:1520", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3::el8", "package": "jws5-tomcat-0:9.0.30-3.redhat_4.1.el8jws", "product_name": "Red Hat JBoss Web Server 5.3 on RHEL 8", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:1520", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3::el8", "package": "jws5-tomcat-native-0:1.2.23-4.redhat_4.el8jws", "product_name": "Red Hat JBoss Web Server 5.3 on RHEL 8", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:1521", "cpe": "cpe:/a:redhat:jboss_enterprise_web_server:5.3", "package": "tomcat", "product_name": "Red Hat JBoss Web Server (JWS) 5.3", "release_date": "2020-04-21T00:00:00Z"}, {"advisory": "RHSA-2020:2367", "cpe": "cpe:/a:redhat:openshift_application_runtimes:1.0", "package": "tomcat", "product_name": "Red Hat Runtimes Spring Boot 2.1.13", "release_date": "2020-06-04T00:00:00Z"}], "bugzilla": {"description": "tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling", "id": "1806835", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1806835"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-444", "details": ["In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.", "A flaw was found in Apache Tomcat. The HTTP header parsing code used an approach to end-of-line (EOL) parsing that allowed some invalid HTTP headers to be parsed as valid. This led to the possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. The highest threat with this vulnerability is system availability."], "mitigation": {"lang": "en:us", "value": "Workaround for Red Hat Satellite 6 is to add iptables rule to deny TCP requests of Tomcat that are not originating from the Satellite.\nFor other Red Hat products, either mitigation isn't available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2020-1935", "package_state": [{"cpe": "cpe:/a:redhat:jboss_enterprise_brms_platform:7", "fix_state": "Not affected", "package_name": "tomcat", "product_name": "Red Hat Decision Manager 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "tomcat5", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "tomcat6", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:6", "fix_state": "Out of support scope", "package_name": "jbossweb", "product_name": "Red Hat JBoss Enterprise Application Platform 6"}, {"cpe": "cpe:/a:redhat:jboss_fuse:6", "fix_state": "Out of support scope", "package_name": "tomcat", "product_name": "Red Hat JBoss Fuse 6"}, {"cpe": "cpe:/a:redhat:openstack:10", "fix_state": "Out of support scope", "package_name": "opendaylight", "product_name": "Red Hat OpenStack Platform 10 (Newton)"}, {"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Will not fix", "package_name": "opendaylight", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Not affected", "package_name": "tomcat", "product_name": "Red Hat Process Automation 7"}], "public_date": "2020-02-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-1935\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-1935\nhttps://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.100\nhttps://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.51\nhttps://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.31"], "statement": "OpenDaylight in Red Hat OpenStack 10 & 13 was in technical preview status, because of this no fixes will be released for it.\nIn Red Hat Satellite 6, Candlepin is using Tomcat to provide a REST API, and has been found to be vulnerable to the flaw. However, it is currently believed that no useful attacks can be carried over.", "threat_severity": "Low"}

{}