CVE-2020-1938 (GCVE-0-2020-1938)

Vulnerability from cvelistv5 – Published: 2020-02-24 21:19 – Updated: 2025-10-21 23:35
VLAI CISA KEV
Summary
When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • AJP Request Injection leading to possible Remote Code Execution
Assigner
References
URL Tags
https://lists.apache.org/thread.html/r7c6f492fbd3… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r856cdd87eda… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r75113652e46… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd0774c95699… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r74328b178f9… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rce2af55f6e1… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rad36ec6a1ff… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb2fc890bef2… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r38a5b7943b9… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r17aaa3a05b5… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd50baccd1bb… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r4afa11e0464… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r772335e6851… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/re5eecbe5bf9… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5e2f1201b92… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r549b43509e3… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r61f280a7690… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r4f86cb26019… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9f119d9ce92… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r089dc67c035… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rbdb1d2b651a… mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://lists.apache.org/thread.html/rc068e824654… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf26663f42e7… mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202003-43 vendor-advisoryx_refsource_GENTOO
https://lists.apache.org/thread.html/rcd5cd301e9e… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf992c5adf37… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r6a5633cad1b… mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.apache.org/thread.html/r43faacf6457… mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
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://lists.apache.org/thread.html/rb1c0fb105ce… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra7092f74925… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r8f748458945… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujul2020.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020022… x_refsource_CONFIRM
http://support.blackberry.com/kb/articleDetail?ar… x_refsource_CONFIRM
https://lists.apache.org/thread.html/r92d78655c06… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf1bbc0ea4a9… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://lists.apache.org/thread.html/r57f5e4ced43… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r47caef01f66… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
https://lists.apache.org/thread.html/r90890afea72… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r1125f3044a0… mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version
Apache Apache Tomcat Affected: Apache Tomcat 9.0.0.M1 to 9.0.0.30
Affected: 8.5.0 to 8.5.50
Affected: 7.0.0 to 7.0.99
Create a notification for this product.
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 74c54bc4-aebb-4da6-9175-294e55193ccb

Vulnerability ID: CVE-2020-1938

Status: Confirmed

Status Updated: 2022-03-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-03
Asserted: 2022-03-03
Scope
Notes: KEV entry: Apache Tomcat Improper Privilege Management Vulnerability | Affected: Apache / Tomcat | Description: Apache Tomcat treats Apache JServ Protocol (AJP) connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited. | Required action: Apply updates per vendor instructions. | Due date: 2022-03-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-1938
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes
Feed CISA Known Exploited Vulnerabilities Catalog
Product Tomcat
Due Date 2022-03-17
Date Added 2022-03-03
Vendorproject Apache
Vulnerabilityname Apache Tomcat Improper Privilege Management Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:25 UTC | Updated: 2026-02-06 07:53 UTC
Show details on NVD website
To clipboard 

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              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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                "options": [
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                  {
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              "content": {
                "dateAdded": "2022-03-03",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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            "value": "CVE-2020-1938 added to CISA KEV"
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        "title": "CISA ADP Vulnrichment"
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          "product": "Apache Tomcat",
          "vendor": "Apache",
          "versions": [
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            },
            {
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          "value": "When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations."
        }
      ],
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          "descriptions": [
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              "description": "AJP Request Injection leading to possible Remote Code Execution",
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        "shortName": "apache"
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          "name": "[tomcat-users] 20200301 Re: [SECURITY] CVE-2020-1938 AJP Request Injection and potential Remote Code Execution",
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          "url": "https://lists.apache.org/thread.html/rb2fc890bef23cbc7f343900005fe1edd3b091cf18dada455580258f9%40%3Cusers.tomcat.apache.org%3E"
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          "name": "[tomcat-users] 20200302 Re: AW: [SECURITY] CVE-2020-1938 AJP Request Injection and potentialRemote Code Execution",
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          "url": "https://lists.apache.org/thread.html/r38a5b7943b9a62ecb853acc22ef08ff586a7b3c66e08f949f0396ab1%40%3Cusers.tomcat.apache.org%3E"
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          "url": "https://lists.apache.org/thread.html/r17aaa3a05b5b7fe9075613dd0c681efa60a4f8c8fbad152c61371b6e%40%3Cusers.tomcat.apache.org%3E"
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          "url": "https://lists.apache.org/thread.html/rd50baccd1bbb96c2327d5a8caa25a49692b3d68d96915bd1cfbb9f8b%40%3Cusers.tomcat.apache.org%3E"
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          "url": "https://lists.apache.org/thread.html/r772335e6851ad33ddb076218fa4ff70de1bf398d5b43e2ddf0130e5d%40%3Cdev.tomcat.apache.org%3E"
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          "name": "[debian-lts-announce] 20200304 [SECURITY] [DLA 2133-1] tomcat7 security update",
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          "name": "[tomcat-users] 20200305 Aw: Re: Fix for CVE-2020-1938",
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          "url": "https://lists.apache.org/thread.html/r5e2f1201b92ee05a0527cfc076a81ea0c270be299b87895c0ddbe02b%40%3Cusers.tomcat.apache.org%3E"
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          "name": "[tomcat-dev] 20200309 [Bug 64206] Answer file not being used",
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          "name": "[tomcat-users] 20200309 Re: Apache Tomcat AJP File Inclusion Vulnerability (unauthenticated check)",
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          "url": "https://lists.apache.org/thread.html/r089dc67c0358a1556dd279c762c74f32d7a254a54836b7ee2d839d8e%40%3Cdev.tomee.apache.org%3E"
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          "url": "https://lists.apache.org/thread.html/rbdb1d2b651a3728f0ceba9e0853575b6f90296a94a71836a15f7364a%40%3Cdev.tomee.apache.org%3E"
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        {
          "name": "openSUSE-SU-2020:0345",
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        {
          "name": "[tomee-dev] 20200316 RE: CVE-2020-8840 on TomEE 8.0.1",
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          "name": "[httpd-bugs] 20200319 [Bug 53098] mod_proxy_ajp: patch to set worker secret passed to tomcat",
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          "url": "https://lists.apache.org/thread.html/rf26663f42e7f1a1d1cac732469fb5e92c89908a48b61ec546dbb79ca%40%3Cbugs.httpd.apache.org%3E"
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          "name": "GLSA-202003-43",
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          "name": "[tomee-commits] 20200320 [jira] [Updated] (TOMEE-2789) TomEE plus(7.0.7) is affected by CVE-2020-1938(BDSA-2020-0339) vulnerability.",
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          "url": "https://lists.apache.org/thread.html/rcd5cd301e9e7e39f939baf2f5d58704750be07a5e2d3393e40ca7194%40%3Ccommits.tomee.apache.org%3E"
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          "name": "[tomee-commits] 20200320 [jira] [Created] (TOMEE-2789) TomEE plus is affected by CVE-2020-1938(BDSA-2020-0339) vulnerability.",
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        {
          "name": "[tomee-commits] 20200323 [jira] [Commented] (TOMEE-2789) TomEE plus(7.0.7) is affected by CVE-2020-1938(BDSA-2020-0339) vulnerability.",
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          "name": "FEDORA-2020-c870aa8378",
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          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L46WJIV6UV3FWA5O5YEY6XLA73RYD53B/"
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  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2020-1938",
    "datePublished": "2020-02-24T21:19:18.000Z",
    "dateReserved": "2019-12-02T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:35:50.835Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2020-1938",
      "dateAdded": "2022-03-03",
      "dueDate": "2022-03-17",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://nvd.nist.gov/vuln/detail/CVE-2020-1938",
      "product": "Tomcat",
      "requiredAction": "Apply updates per vendor instructions.",
      "shortDescription": "Apache Tomcat treats Apache JServ Protocol (AJP) connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited.",
      "vendorProject": "Apache",
      "vulnerabilityName": "Apache Tomcat Improper Privilege Management Vulnerability"
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    "epss": {
      "cve": "CVE-2020-1938",
      "date": "2026-05-30",
      "epss": "0.94469",
      "percentile": "0.99998"
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This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. 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Este reporte de vulnerabilidad identific\u00f3 un mecanismo que permit\u00eda: - devolver archivos arbitrarios desde cualquier lugar de la aplicaci\u00f3n web - procesar cualquier archivo en la aplicaci\u00f3n web como JSP. Adem\u00e1s, si la aplicaci\u00f3n web permit\u00eda cargar archivos y almacenarlos dentro de la aplicaci\u00f3n web (o el atacante fue capaz de controlar el contenido de la aplicaci\u00f3n web por otros medios) y esto, junto con la capacidad de procesar un archivo como JSP, hizo posible una ejecuci\u00f3n de c\u00f3digo remota. Es importante notar que la mitigaci\u00f3n solo es requerida si un puerto AJP es accesible por usuarios no confiables. Los usuarios que deseen adoptar un enfoque de defensa en profundidad y bloquear el vector que permite la devoluci\u00f3n de archivos arbitrarios y una ejecuci\u00f3n como JSP pueden actualizar a Apache Tomcat versiones 9.0.31, 8.5.51 o 7.0.100 o posterior. Se realizaron un n\u00famero de cambios en la configuraci\u00f3n predeterminada del conector AJP en la versi\u00f3n 9.0.31 para fortalecer la configuraci\u00f3n predeterminada. Es probable que los usuarios que actualicen a versiones 9.0.31, 8.5.51 o 7.0.100 o posterior necesitar\u00e1n llevar a cabo peque\u00f1os cambios en sus 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Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. 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\"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2XFLQB3O5QVP4ZBIPVIXBEZV7F2R7ZMS/\", \"name\": \"FEDORA-2020-0e42878ba7\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L46WJIV6UV3FWA5O5YEY6XLA73RYD53B/\", \"name\": \"FEDORA-2020-c870aa8378\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/K3IPNHCKFVUKSHDTM45UL4Q765EHHTFG/\", \"name\": \"FEDORA-2020-04ac174fa9\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.apache.org/thread.html/r43faacf64570b1d9a4bada407a5af3b2738b0c007b905f1b6b608c65@%3Cusers.tomcat.apache.org%3E\", \"name\": \"[tomcat-users] 20200413 RE: Alternatives for AJP\", \"refsource\": \"MLIST\"}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00002.html\", \"name\": \"openSUSE-SU-2020:0597\", \"refsource\": \"SUSE\"}, {\"url\": \"https://www.debian.org/security/2020/dsa-4673\", \"name\": \"DSA-4673\", \"refsource\": \"DEBIAN\"}, {\"url\": \"https://www.debian.org/security/2020/dsa-4680\", \"name\": \"DSA-4680\", \"refsource\": \"DEBIAN\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html\", \"name\": \"[debian-lts-announce] 20200528 [SECURITY] [DLA 2209-1] tomcat8 security update\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.apache.org/thread.html/rb1c0fb105ce2b93b7ec6fc1b77dd208022621a91c12d1f580813cfed@%3Cdev.tomcat.apache.org%3E\", \"name\": \"[tomcat-dev] 20200625 svn commit: r1879208 - in /tomcat/site/trunk: docs/security-10.html docs/security-8.html docs/security-9.html xdocs/security-10.xml xdocs/security-8.xml xdocs/security-9.xml\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.apache.org/thread.html/ra7092f7492569b39b04ec0decf52628ba86c51f15efb38f5853e2760@%3Cnotifications.ofbiz.apache.org%3E\", \"name\": \"[ofbiz-notifications] 20200628 [jira] [Updated] (OFBIZ-11847) CLONE - Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996)\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887c922fb1@%3Cnotifications.ofbiz.apache.org%3E\", \"name\": \"[ofbiz-notifications] 20200628 [jira] [Created] (OFBIZ-11847) CLONE - Upgrade Tomcat from 9.0.34 to 9.0.36 (CVE-2020-11996)\", \"refsource\": \"MLIST\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpujul2020.html\", \"name\": \"https://www.oracle.com/security-alerts/cpujul2020.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20200226-0002/\", \"name\": \"https://security.netapp.com/advisory/ntap-20200226-0002/\", \"refsource\": \"CONFIRM\"}, {\"url\": \"http://support.blackberry.com/kb/articleDetail?articleNumber=000062739\", \"name\": \"http://support.blackberry.com/kb/articleDetail?articleNumber=000062739\", \"refsource\": \"CONFIRM\"}, {\"url\": 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\"https://lists.apache.org/thread.html/r47caef01f663106c2bb81d116b8380d62beac9e543dd3f3bc2c2beda@%3Ccommits.tomee.apache.org%3E\", \"name\": \"[tomee-commits] 20201127 [jira] [Updated] (TOMEE-2789) TomEE plus(7.0.7) is affected by CVE-2020-1938(BDSA-2020-0339) vulnerability.\", \"refsource\": \"MLIST\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2021.html\", \"name\": \"https://www.oracle.com/security-alerts/cpujan2021.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://lists.apache.org/thread.html/r90890afea72a9571d666820b2fe5942a0a5f86be406fa31da3dd0922@%3Cannounce.apache.org%3E\", \"name\": \"[announce] 20210125 Apache Software Foundation Security Report: 2020\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.apache.org/thread.html/r1125f3044a0946d1e7e6f125a6170b58d413ebd4a95157e4608041c7@%3Cannounce.apache.org%3E\", \"name\": \"[announce] 20210223 Re: Apache Software Foundation Security Report: 2020\", \"refsource\": \"MLIST\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"AJP Request Injection leading to possible Remote Code Execution\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2020-1938\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"security@apache.org\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2020-1938\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:35:50.835Z\", \"dateReserved\": \"2019-12-02T00:00:00.000Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2020-02-24T21:19:18.000Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.





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.