Remote Code Execution (RCE) Affecting org.apache.tomcat.embed:tomcat-embed-core package, versions [10.0.0-M1, 10.0.0-M5) [9.0.0M1, 9.0.35) [8.5.0, 8.5.55) [7.0.0, 7.0.104)



    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Mature
    EPSS 88.36% (99th percentile)
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7 high
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7.5 high
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Red Hat
7 high

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  • published 20 May 2020
  • disclosed 21 May 2020
  • credit Apache Tomcat Security Team

How to fix?

Upgrade org.apache.tomcat.embed:tomcat-embed-core to version 10.0.0-M5, 9.0.35, 8.5.55, 7.0.104 or higher.


org.apache.tomcat.embed:tomcat-embed-core is a Core Tomcat implementation.

Affected versions of this package are vulnerable to Remote Code Execution (RCE). If an attacker is able to control the contents and name of a file on the server; and the server is configured to use the PersistenceManager with a FileStore; and the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control.