# CVE-2020-9484: libservlet3.0-java: 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... CVE-2020-9484 is fixed in 17 products on 1 platform, first by libtomcat9-embed-java 9.0.31-1ubuntu0.1, released July 14, 2020. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2020-9484 - Priority: Routine - CVSS: n/a (Low) - EPSS: 0.5552 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 20, 2020 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libservlet3.0-java Ubuntu 18.04.6 LTS (bionic) | 7.0.78-1ubuntu0.1~esm1 | [libservlet3.0-java 7.0.78-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libservlet3.0-java-7.0.78-1ubuntu0.1-esm1.md) | Mar 1, 2021 | | Linux | libtomcat8-embed-java Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [libtomcat8-embed-java 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtomcat8-embed-java-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | libtomcat8-java Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [libtomcat8-java 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtomcat8-java-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | libtomcat9-embed-java Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [libtomcat9-embed-java 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtomcat9-embed-java-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | libtomcat9-embed-java Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [libtomcat9-embed-java 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtomcat9-embed-java-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | libtomcat9-java Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [libtomcat9-java 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtomcat9-java-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | libtomcat9-java Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [libtomcat9-java 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtomcat9-java-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | tomcat8 Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [tomcat8 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat8-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | tomcat8-admin Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [tomcat8-admin 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat8-admin-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | tomcat8-common Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [tomcat8-common 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat8-common-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | tomcat8-docs Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [tomcat8-docs 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat8-docs-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | tomcat8-examples Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [tomcat8-examples 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat8-examples-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | tomcat8-user Ubuntu 18.04.6 LTS (bionic) | 8.5.39-1ubuntu1~18.04.3+esm2 | [tomcat8-user 8.5.39-1ubuntu1~18.04.3+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat8-user-8.5.39-1ubuntu1-18.04.3-esm2.md) | May 12, 2022 | | Linux | tomcat9 Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [tomcat9 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat9-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | tomcat9 Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [tomcat9 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | tomcat9-admin Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [tomcat9-admin 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat9-admin-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | tomcat9-admin Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [tomcat9-admin 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-admin-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | tomcat9-common Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [tomcat9-common 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat9-common-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | tomcat9-common Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [tomcat9-common 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-common-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | tomcat9-docs Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [tomcat9-docs 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat9-docs-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | tomcat9-docs Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [tomcat9-docs 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-docs-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | tomcat9-examples Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [tomcat9-examples 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat9-examples-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | tomcat9-examples Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [tomcat9-examples 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-examples-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | | Linux | tomcat9-user Ubuntu 18.04.6 LTS (bionic) | 9.0.16-3ubuntu0.18.04.2 | [tomcat9-user 9.0.16-3ubuntu0.18.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tomcat9-user-9.0.16-3ubuntu0.18.04.2.md) | Sep 16, 2021 | | Linux | tomcat9-user Ubuntu 20.04 LTS (focal) | 9.0.31-1ubuntu0.1 | [tomcat9-user 9.0.31-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-user-9.0.31-1ubuntu0.1.md) | Jul 14, 2020 | --- Data as of 2026-11-07T18:46:35Z UTC. 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