---
title: "CVE-2018-8020\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-2018-8020?format=md
keywords: index, follow
---

# CVE-2018-8020

Publication date 31 July 2018

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.4 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2018-8020?format=md#impact-score)

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## Description

Apache Tomcat Native 1.2.0 to 1.2.16 and 1.1.23 to 1.1.34 has a flaw that
does not properly check OCSP pre-produced responses, which are lists
(multiple entries) of certificate statuses. Subsequently, revoked client
certificates may not be properly identified, allowing for users to
authenticate with revoked certificates to connections that require mutual
TLS. Users not using OCSP checks are not affected by this vulnerability.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tomcat-native | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Vulnerable |
| 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)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.4 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.4 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8020)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-8020)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-8020)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-8020)

### Other references

* <https://svn.apache.org/r1832863>
* <http://mail-archives.us.apache.org/mod_mbox/www-announce/201807.mbox/%3C20180721101944.GA45239@minotaur.apache.org%3E>
* <https://www.cve.org/CVERecord?id=CVE-2018-8020>