# CVE-2020-17527: libtomcat9-embed-java: While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5...

CVE-2020-17527 is fixed in 8 products on 1 platform, first by libtomcat9-embed-java 9.0.16-3ubuntu0.18.04.2, released September 16, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-17527
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.2462
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 3, 2020

## Description

While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| 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) | 9.0.31-1ubuntu0.2 | [libtomcat9-embed-java 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtomcat9-embed-java-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [libtomcat9-java 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtomcat9-java-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [tomcat9 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [tomcat9-admin 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-admin-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [tomcat9-common 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-common-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [tomcat9-docs 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-docs-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [tomcat9-examples 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-examples-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |
| 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) | 9.0.31-1ubuntu0.2 | [tomcat9-user 9.0.31-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tomcat9-user-9.0.31-1ubuntu0.2.md) | Sep 16, 2021 |

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