---
title: "CVE-2018-8037\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2018-8037?format=md
keywords: index, follow
---

# CVE-2018-8037

Publication date 2 August 2018

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2018-8037?format=md#impact-score)

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## Description

If an async request was completed by the application at the same time as
the container triggered the async timeout, a race condition existed that
could result in a user seeing a response intended for a different user. An
additional issue was present in the NIO and NIO2 connectors that did not
correctly track the closure of the connection when an async request was
completed by the application and timed out by the container at the same
time. This could also result in a user seeing a response intended for
another user. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.9 and 8.5.5
to 8.5.31.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2018-8037?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tomcat8 | 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Fixed 8.5.39-1ubuntu1~18.04.1 |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| tomcat8.0 | 18.10 cosmic | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2018-8037?format=md#patch-details)

## Notes

---

### [debian](https://launchpad.net/~debian)

Vulnerable code only present in 8.5.5 to 8.5.31 in 8.x series

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| tomcat8 | * Upstream:   <https://svn.apache.org/r1833907> * Upstream:   <https://svn.apache.org/r1833826> * Upstream:   <https://svn.apache.org/r1833832> * Upstream:   <https://svn.apache.org/r1837531> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8037)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-8037)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-8037)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-8037)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2018-8037>