--- title: "CVE-2018-2952\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-2018-2952?format=md keywords: index, follow --- # CVE-2018-2952 Publication date 18 July 2018 Last updated 25 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **3.7 · Low** [Score breakdown](https://ubuntu.com/security/CVE-2018-2952?format=md#impact-score) Toggle side navigation ## Description Vulnerability in the Java SE, Java SE Embedded, JRockit component of Oracle Java SE (subcomponent: Concurrency). Supported versions that are affected are Java SE: 6u191, 7u181, 8u172 and 10.0.1; Java SE Embedded: 8u171; JRockit: R28.3.18. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded, JRockit. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Java SE, Java SE Embedded, JRockit. Note: Applies to client and server deployment of Java. This vulnerability can be exploited through sandboxed Java Web Start applications and sandboxed Java applets. It can also be exploited by supplying data to APIs in the specified Component without using sandboxed Java Web Start applications or sandboxed Java applets, such as through a web service. CVSS 3.0 Base Score 3.7 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L). ### From the Ubuntu Security Team It was discovered that the PatternSyntaxException class in OpenJDK did not properly validate arguments passed to it. An attacker could use this to potentially construct a class that caused a denial of service (excessive memory consumption). ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | openjdk-6 | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Not in release | | 20.04 LTS focal | Not in release | | 19.10 eoan | Not in release | | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | openjdk-7 | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Not in release | | 20.04 LTS focal | Not in release | | 19.10 eoan | Not in release | | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Fixed 7u181-2.6.14-0ubuntu0.2 | | openjdk-8 | 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 | Fixed 8u181-b13-0ubuntu0.18.04.1 | | 17.10 artful | Ignored end of life | | 16.04 LTS xenial | Fixed 8u181-b13-0ubuntu0.16.04.1 | | 14.04 LTS trusty | Not in release | | openjdk-9 | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Not in release | | 20.04 LTS focal | Not in release | | 19.10 eoan | Not in release | | 19.04 disco | Not in release | | 18.10 cosmic | Not in release | | 18.04 LTS bionic | Not in release | | 17.10 artful | Ignored end of life | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not in release | | openjdk-lts | 22.04 LTS jammy | Fixed 10.0.2+13-1ubuntu1 | | 21.10 impish | Fixed 10.0.2+13-1ubuntu1 | | 21.04 hirsute | Fixed 10.0.2+13-1ubuntu1 | | 20.10 groovy | Fixed 10.0.2+13-1ubuntu1 | | 20.04 LTS focal | Fixed 10.0.2+13-1ubuntu1 | | 19.10 eoan | Fixed 10.0.2+13-1ubuntu1 | | 19.04 disco | Fixed 10.0.2+13-1ubuntu1 | | 18.10 cosmic | Fixed 10.0.2+13-1ubuntu1 | | 18.04 LTS bionic | Fixed 10.0.2+13-1ubuntu0.18.04.1 | | 17.10 artful | 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-2018-2952?format=md#patch-details) ### 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 | | --- | --- | | openjdk-8 | * Upstream: | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 3.7 · Low * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | High | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | Low | * Scores | Parameter | Value | | --- | --- | | Base score | 3.7 · Low | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-2952) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-2952) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-2952) * [Debian](https://security-tracker.debian.org/tracker/CVE-2018-2952) ### Related Ubuntu Security Notices (USN) + [USN-3735-1](https://usn.ubuntu.com/USN-3735-1) + OpenJDK 7 vulnerability + 10 August 2018 + [USN-3734-1](https://usn.ubuntu.com/USN-3734-1) + OpenJDK 8 vulnerability + 10 August 2018 + [USN-3747-1](https://usn.ubuntu.com/USN-3747-1) + OpenJDK 10 vulnerabilities + 21 August 2018 ### Other references *