CVE-2020-1938

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Summary

CVECVE-2020-1938
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-02-24 22:15:12 UTC
Updated2026-08-25 16:28:27 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.992700000 probability, percentile 0.999350000 (date 2026-09-10)

CISA KEV: Listed on 2022-03-03; due 2022-03-17; ransomware use Unknown

Problem Types: NVD-CWE-Other | AJP Request Injection leading to possible Remote Code Execution | CWE-noinfo Not enough information

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:N/C:P/I:P/A:P

CISA Known Exploited Vulnerability

VendorApache
ProductTomcat
NameApache Tomcat Improper Privilege Management Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://nvd.nist.gov/vuln/detail/CVE-2020-1938

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Geode 1.12.0 All All All
Application Apache Tomcat All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Apache Tomcat affected Apache Tomcat 9.0.0.M1 to 9.0.0.30 Not specified
CNA Apache Apache Tomcat affected 8.5.0 to 8.5.50 Not specified
CNA Apache Apache Tomcat affected 7.0.0 to 7.0.99 Not specified

References

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[security-announce] openSUSE-SU-2020:0597-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
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Debian -- Security Information -- DSA-4673-1 tomcat8 af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
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Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
[SECURITY] [DLA 2133-1] tomcat7 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
[SECURITY] Fedora 31 Update: tomcat-9.0.31-2.fc31 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Release Notes
Oracle Critical Patch Update Advisory - January 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
[SECURITY] Fedora 30 Update: tomcat-9.0.31-2.fc30 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Release Notes
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Issue Tracking, Mailing List
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Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List, Patch
Oracle Critical Patch Update Advisory - October 2020 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List, Vendor Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Exploit, Mailing List
BSRT-2020-001 Local File Inclusion Vulnerability in Apache Tomcat Impacts BlackBerry Workspaces Server and BlackBerry Good Control af854a3a-2127-422b-91ae-364da2661108 support.blackberry.com Third Party Advisory
[security-announce] openSUSE-SU-2020:0345-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
[SECURITY] [DLA 2209-1] tomcat8 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
Debian -- Security Information -- DSA-4680-1 tomcat9 af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Issue Tracking, Mailing List
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Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List, Vendor Advisory
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Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List, Vendor Advisory
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Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List, Patch
[SECURITY] Fedora 32 Update: tomcat-9.0.31-2.fc32 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org Release Notes
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
Oracle Critical Patch Update Advisory - July 2020 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
Apache Tomcat: Multiple vulnerabilities (GLSA 202003-43) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
CVE-2020-1938 Apache Tomcat Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Mailing List
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org Issue Tracking, Mailing List
[SECURITY] Fedora 31 Update: tomcat-9.0.31-2.fc31 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 32 Update: tomcat-9.0.31-2.fc32 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
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Additional Advisory Data

SourceTimeEvent
ADP2022-03-03T00:00:00.000ZCVE-2020-1938 added to CISA KEV

Legacy QID Mappings

  • 356190 Amazon Linux Security Advisory for tomcat : ALASTOMCAT8.5-2023-012
  • 377084 Alibaba Cloud Linux Security Update for tomcat (ALINUX2-SA-2020:0032)
  • 730112 Atlassian Jira Component Apache Tomcat Hypertext Transfer Protocol (HTTP) Request Smuggling Vulnerability (JRASERVER-70993)
  • 730434 Update TITLE manually (JRASERVER-70487)
  • 730441 Atlassian Jira Local Privilege Escalation Vulnerability (JRASERVER-70487)
  • 730449 (JRASERVER-70487)
  • 730510 Atlassian Jira Remote Code Execution (RCE) Vulnerability (JRASERVER-73223)
  • 981939 Java (maven) Security Update for org.apache.tomcat.embed:tomcat-embed-core (GHSA-c9hw-wf7x-jp9j)

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