CVE-2020-1938Known exploitationPublic exploitNetwork attack vector

Unauthenticated file read via injected AJP attributes

Published Feb 24, 2020 · Updated Oct 21, 2025

AJP request injection in affected Apache Tomcat releases allows remote attackers to read arbitrary web application files over exposed AJP. AjpProcessor accepts attacker-supplied arbitrary request attributes and applies crafted servlet include paths, causing the JSP servlet to return protected resources or process chosen files as JSP. The AJP port must be reachable by an untrusted party; code execution additionally requires attacker-controlled content inside the web application.

CVSS severity9.8
Critical
EPSS probability99.27%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

AJP request injection in affected Apache Tomcat releases allows remote attackers to read arbitrary web application files over exposed AJP. AjpProcessor accepts attacker-supplied arbitrary request attributes and applies crafted servlet include paths, causing the JSP servlet to return protected resources or process chosen files as JSP. The AJP port must be reachable by an untrusted party; code execution additionally requires attacker-controlled content inside the web application.

The record

CVE
CVE-2020-1938
Published
Feb 24, 2020
Updated
Oct 21, 2025
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 to 7.0.99
  2. Affected versionversion=8.5.0 to 8.5.50
  3. Affected versionversion=Apache Tomcat 9.0.0.M1 to 9.0.0.30

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=7.0.0 to 7.0.99; version=8.5.0 to 8.5.50; version=Apache Tomcat 9.0.0.M1 to 9.0.0.30

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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