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Vulnerabilities/CVE-2020-1938
Vulnerability dossier

CVE-2020-1938

VendororaclePublishedFeb 24, 2020SourceNVD
Act now

Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.

⚙ WeaponizedMetasploit module availableopen ↗PoCPublic exploit on Exploit-DB#48143 ↗#49039 ↗
Severity
Critical · 9.8
CVSS base score
Exploitation
In the wild
CISA KEV · Metasploit · Exploit-DB
Predicted risk
99% model
EPSS forecast — overtaken by confirmed exploitation
Exposure
Internet-facing
Exploitable remotely, no login, no user action
01

What's the risk?

An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.

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.

How it's exploitedMITRE ATT&CK · inferred from weakness & vector
Initial Access
T1190Exploit Public-Facing Application

Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.

02

Who's exploiting it?

Corroborated threat activity referencing this CVE — with source and confidence, not inference.

Confirmed exploited in the wild. CISA KEV · catalogued Mar 3, 2022

Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.

03

Are we affected?

38
  • Affectedapache · geode1.12.0
  • Affectedapache · tomcat≥ 7.0.0, < 7.0.100↑ fixed 7.0.100
  • Affectedapache · tomcat≥ 8.5.0, < 8.5.51↑ fixed 8.5.51
  • Affectedapache · tomcat≥ 9.0.0, < 9.0.31↑ fixed 9.0.31
  • Affectedblackberry · good_control≤ 5.2.58.38
  • Affectedblackberry · workspaces_server8.1.0
  • Affectedblackberry · workspaces_server7.0.1
  • Affectedblackberry · workspaces_server7.1.2
  • Affectedblackberry · workspaces_server9.0
  • Affecteddebian · debian_linux8.0
  • Affecteddebian · debian_linux10.0
  • Affecteddebian · debian_linux9.0
  • Affectedfedoraproject · fedora31
  • Affectedfedoraproject · fedora30
  • Affectedfedoraproject · fedora32
  • Affectednetapp · data_availability_servicesall versions
  • Affectednetapp · oncommand_system_manager≥ 3.0.0, ≤ 3.1.3
  • Affectedopensuse · leap15.1
  • Affectedoracle · agile_engineering_data_management6.2.1.0
  • Affectedoracle · agile_product_lifecycle_management9.3.3
  • Affectedoracle · agile_product_lifecycle_management9.3.5
  • Affectedoracle · agile_product_lifecycle_management9.3.6
  • Affectedoracle · communications_element_manager8.1.1
  • Affectedoracle · communications_element_manager8.2.0
  • Affectedoracle · communications_element_manager8.2.1
  • Affectedoracle · communications_instant_messaging_server10.0.1.4.0
  • Affectedoracle · health_sciences_empirica_inspections1.0.1.2
  • Affectedoracle · health_sciences_empirica_signal7.3.3
  • Affectedoracle · hospitality_guest_access4.2.0
  • Affectedoracle · hospitality_guest_access4.2.1
  • Affectedoracle · instantis_enterprisetrack≥ 17.1, ≤ 17.3
  • Affectedoracle · mysql_enterprise_monitor≤ 4.0.12
  • Affectedoracle · mysql_enterprise_monitor≥ 8.0.0, ≤ 8.0.20
  • Affectedoracle · siebel_ui_framework≤ 20.5
  • Affectedoracle · transportation_management6.3.7
  • Affectedoracle · workload_manager19c
  • Affectedoracle · workload_manager12.2.0.1
  • Affectedoracle · workload_manager18c
04

What to do

Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.

  1. !

    Mitigate now

    If the AJP Connector is not required, disable it immediately in `server.xml`. If AJP is essential, restrict network access to the AJP port (default 8009) via firewalls, allowing connections only from trusted internal systems. Additionally, configure an AJP `secret` attribute to ensure mutual authentication between Tomcat and the front-end web server.

  2. ✓

    Permanent fix

    Upgrade Apache Tomcat to version 9.0.31, 8.5.51, 7.0.100, or later to address this vulnerability. These versions include a hardened default AJP Connector configuration. Users should review their AJP configurations after upgrading, as minor adjustments may be necessary due to default setting changes.

Technical details— weakness, CVSS vector & calculator, related CVEs

Business impact

An attacker can read arbitrary files from the web application and process any file as a JSP. If file upload is enabled or content is controllable, this allows remote code execution on the server. This could lead to full system compromise, data exfiltration, and service disruption, with severe business and reputational consequences.

Weakness

No CWE classification has been assigned.

CVSS 3.1 details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.0
/ 10.0 base
Critical severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability metrics
Attack VectorAV
Remotely exploitable across a network
Attack ComplexityAC
No special conditions required
Privileges RequiredPR
No authorization needed
User InteractionUI
No user participation needed
Impact metrics
ScopeS
Impact confined to the vulnerable component
ConfidentialityC
Total loss of confidentiality
IntegrityI
Total loss of integrity
AvailabilityA
Total loss of availability

Related vulnerabilities

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In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.

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Path Equivalence: 'file.Name' (Internal Dot) leading to Remote Code Execution and/or Information disclosure and/or malicious content added to uploaded files via write enabled Default Servlet in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.2, from 10.1.0-M1 through 10.1.34, from 9.0.0.M1 through 9.0.98. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Other, older, EOL versions may also be affected. If all of the following were true, a malicious user was able to view security sensitive files and/or inject content into those files: - writes enabled for the default servlet (disabled by default) - support for partial PUT (enabled by default) - a target URL for security sensitive uploads that was a sub-directory of a target URL for public uploads - attacker knowledge of the names of security sensitive files being uploaded - the security sensitive files also being uploaded via partial PUT If all of the following were true, a malicious user was able to perform remote code execution: - writes enabled for the default servlet (disabled by default) - support for partial PUT (enabled by default) - application was using Tomcat's file based session persistence with the default storage location - application included a library that may be leveraged in a deserialization attack Users are recommended to upgrade to version 11.0.3, 10.1.35 or 9.0.99, which fixes the issue.

apacheCWE-44NetworkLow effortNo authNo interactionCIA
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0.0
/ 10.0 base
Critical severity
Key facts
CVE ID
CVE-2020-1938
Published
Feb 24, 2020
Last modified
Aug 25, 2026
CVSS
9.8 (v3.1)
EPSS
99.27%
In CISA KEV
Yes
Confidence
98/100
Fixed in
7.0.100, 8.5.51, 9.0.31
Timeline
  1. Feb 24, 2020Published to NVDNVD
  2. Aug 25, 2026Record last modifiedNVD
  3. Aug 17, 2026AI analysis generatedWavense
View on NVD