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CVE-2020-1935 (GCVE-0-2020-1935)

Vulnerability from cvelistv5 – Published: 2020-02-24 21:11 – Updated: 2024-08-04 06:53
VLAI
Summary
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.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE
  • HTTP Request Smuggling
Assigner
References
URL Tags
https://lists.apache.org/thread.html/r127f76181ac… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://lists.apache.org/thread.html/rc31cbabb46c… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r7bc994c965a… mailing-listx_refsource_MLIST
https://www.debian.org/security/2020/dsa-4673 vendor-advisoryx_refsource_DEBIAN
https://www.debian.org/security/2020/dsa-4680 vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujul2020.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020032… x_refsource_CONFIRM
https://lists.apache.org/thread.html/r441c1f30a25… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r660cd379afe… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd547be0c9d8… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra5dee390ad2… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r80e9c8417c7… mailing-listx_refsource_MLIST
https://usn.ubuntu.com/4448-1/ vendor-advisoryx_refsource_UBUNTU
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
https://lists.apache.org/thread.html/r9ce7918faf3… mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version CPE status
Apache Apache Tomcat Affected: Apache Tomcat 9.0.0.M1 to 9.0.30
Affected: 8.5.0 to 8.5.50
Affected: 7.0.0 to 7.0.99
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              "url": "https://www.oracle.com/security-alerts/cpujan2021.html"
            },
            {
              "name": "[tomcat-dev] 20210428 [Bug 65272] Problems proccessing HTTP request without CR in last versions",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6@%3Cdev.tomcat.apache.org%3E"
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    "assignerShortName": "apache",
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    "datePublished": "2020-02-24T21:11:38.000Z",
    "dateReserved": "2019-12-02T00:00:00.000Z",
    "dateUpdated": "2024-08-04T06:53:59.921Z",
    "state": "PUBLISHED"
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"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.\"}, {\"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": "2024-11-21T05:11:38.730",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N\", \"baseScore\": 4.8, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 2.5}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:P/I:P/A:N\", \"baseScore\": 5.8, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 4.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2020-02-24T22:15:11.980",
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      "sourceIdentifier": "security@apache.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-444\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-1935\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2020-02-24T22:15:11.980\",\"lastModified\":\"2024-11-21T05:11:38.730\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":4.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":2.5}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:P/A:N\",\"baseScore\":5.8,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":4.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-444\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.0.0\",\"versionEndIncluding\":\"7.0.99\",\"matchCriteriaId\":\"2EC441A9-309B-4478-A60C-AD9EE2E31C53\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"8.5.0\",\"versionEndIncluding\":\"8.5.50\",\"matchCriteriaId\":\"0CE458D0-7BED-406E-AEDC-0A74D5B2245B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"9.0.0\",\"versionEndIncluding\":\"9.0.30\",\"matchCriteriaId\":\"255568C5-7907-4C8C-BD1A-8F1F6061CE17\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"67BBBD83-E232-4198-9748-C512D9E0EEDD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*\",\"matchCriteriaId\":\"9D0689FE-4BC0-4F53-8C79-34B21F9B86C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*\",\"matchCriteriaId\":\"89B129B2-FB6F-4EF9-BF12-E589A87996CF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B6787B6-54A8-475E-BA1C-AB99334B2535\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*\",\"matchCriteriaId\":\"EABB6FBC-7486-44D5-A6AD-FFF1D3F677E1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*\",\"matchCriteriaId\":\"E10C03BC-EE6B-45B2-83AE-9E8DFB58D7DB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*\",\"matchCriteriaId\":\"8A6DA0BE-908C-4DA8-A191-A0113235E99A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*\",\"matchCriteriaId\":\"39029C72-28B4-46A4-BFF5-EC822CFB2A4C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:*\",\"matchCriteriaId\":\"1A2E05A3-014F-4C4D-81E5-88E725FBD6AD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:*\",\"matchCriteriaId\":\"166C533C-0833-41D5-99B6-17A4FAB3CAF0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:*\",\"matchCriteriaId\":\"D3768C60-21FA-4B92-B98C-C3A2602D1BC4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:*\",\"matchCriteriaId\":\"DDD510FA-A2E4-4BAF-A0DE-F4E5777E9325\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone2:*:*:*:*:*:*\",\"matchCriteriaId\":\"9F542E12-6BA8-4504-A494-DA83E7E19BD5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:*\",\"matchCriteriaId\":\"C2409CC7-6A85-4A66-A457-0D62B9895DC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*\",\"matchCriteriaId\":\"B392A7E5-4455-4B1C-8FAC-AE6DDC70689E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*\",\"matchCriteriaId\":\"EF411DDA-2601-449A-9046-D250419A0E1A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone23:*:*:*:*:*:*\",\"matchCriteriaId\":\"D7D8F2F4-AFE2-47EA-A3FD-79B54324DE02\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone24:*:*:*:*:*:*\",\"matchCriteriaId\":\"1B4FBF97-DE16-4E5E-BE19-471E01818D40\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone25:*:*:*:*:*:*\",\"matchCriteriaId\":\"3B266B1E-24B5-47EE-A421-E0E3CC0C7471\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*\",\"matchCriteriaId\":\"29614C3A-6F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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\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T23:11:56+00:00",
      "cve": "CVE-2020-1935",
      "id": "CVE-2020-1935",
      "initial_release_date": "2020-02-24T00:00:00+00:00",
      "product_status:fixed": "349",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-1935.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T02:30:06Z",
      "cve": "CVE-2020-1935",
      "id": "CVE-2020-1935",
      "initial_release_date": "2023-02-15T04:04:12Z",
      "product_status:known_affected": "500",
      "product_status:known_not_affected": "56",
      "product_status:recommended": "410",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-1935",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-1935.json",
      "version": "35"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.