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CISA KEV · Known exploitedCritical

CVE-2020-1938

Apache Tomcat

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...

CVSS
9.8
EPSS
99.3%
99.9% percentile
CISA KEV
Listed
Published
2020.02.25
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability99.3%
Technical severityCVSS 9.8

Vulnerability overview

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...

Affected product and versions

Product
Apache Tomcat
Affected versions
Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50, 7.0.0 to 7.0.99, 1.12.0, >= 7.0.0 < 7.0.100, >= 8.5.0 < 8.5.51, >= 9.0.0 < 9.0.31, 30, 31, 32, 6.2.1.0, 9.3.3, 9.3.5, 9.3.6, 8.1.1, 8.2.0, 8.2.1, 10.0.1.4.0, 1.0.1.2, 7.3.3
Fixed versions
7.0.100, 8.5.51, 9.0.31

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.03.17
  1. 1
    Identify

    Confirm that Apache Tomcat and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
KEV added
2022.03.03
Ransomware use
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