--- title: "CVE-2015-6806\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-2015-6806?format=md keywords: index, follow --- # CVE-2015-6806 Publication date 28 September 2015 Last updated 24 July 2024 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description The MScrollV function in ansi.c in GNU screen 4.3.1 and earlier does not properly limit recursion, which allows remote attackers to cause a denial of service (stack consumption) via an escape sequence with a large repeat count value. ### From the Ubuntu Security Team It was discovered that GNU screen mishandled certain crafted input. An attacker could use this vulnerability to cause a denial of service. ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | screen | 19.04 disco | Not affected | | 18.10 cosmic | Not affected | | 18.04 LTS bionic | Not affected | | 17.10 artful | Not affected | | 17.04 zesty | Not affected | | 16.10 yakkety | Not affected | | 16.04 LTS xenial | Not affected | | 15.10 wily | Not affected | | 15.04 vivid | Ignored end of life | | 14.04 LTS trusty | Fixed 4.1.0~20120320gitdb59704-9ubuntu0.1~esm1 Ubuntu Pro | | 12.04 LTS precise | Ignored end of life | --- * [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-2015-6806?format=md#patch-details) ### Get expanded security coverage with Ubuntu Pro Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use. [Get Ubuntu Pro](https://ubuntu.com/pro) [30-day free trial](https://ubuntu.com/pro/free-trial) ### 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 | | --- | --- | | screen | * Upstream: [?id=c33](http://git.savannah.gnu.org/cgit/screen.git/commit/?id=c336a32a1dcd445e6b83827f83531d4c6414e2cd) | ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6806) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-6806) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-6806) * [Debian](https://security-tracker.debian.org/tracker/CVE-2015-6806) ### Related Ubuntu Security Notices (USN) + [USN-3996-1](https://usn.ubuntu.com/USN-3996-1) + GNU Screen vulnerability + 29 May 2019 ### Other references * *