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High severity7.0NVD Advisory· Published May 20, 2020· Updated Jun 17, 2026

CVE-2020-9484

CVE-2020-9484

Description

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) 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 d) 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. Note that all of conditions a) to d) must be true for the attack to succeed.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.tomcat:tomcat-catalinaMaven
>= 10.0.0-M1, < 10.0.0-M510.0.0-M5
org.apache.tomcat:tomcat-catalinaMaven
>= 9.0.0, < 9.0.359.0.35
org.apache.tomcat:tomcat-catalinaMaven
>= 8.0.0, < 8.5.558.5.55
org.apache.tomcat:tomcat-catalinaMaven
>= 7.0.0, < 7.0.1047.0.104
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 10.0.0-M1, < 10.0.0-M510.0.0-M5
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 9.0.0, < 9.0.359.0.35
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 8.0.0, < 8.5.558.5.55
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 7.0.0, < 7.0.1047.0.104

Affected products

105

Patches

Vulnerability mechanics

References

78

News mentions

0

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