--- title: CVE-2015-5180 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-2015-5180 --- # CVE-2015-5180 Publication date 10 August 2015 Last updated 25 August 2025 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.5 · High** [Score breakdown](https://ubuntu.com/security/CVE-2015-5180#impact-score) Toggle side navigation ## Description res\_query in libresolv in glibc before 2.25 allows remote attackers to cause a denial of service (NULL pointer dereference and process crash). ### From the Ubuntu Security Team Florian Weimer discovered a NULL pointer dereference in the DNS resolver of the GNU C Library. An attacker could use this to cause a denial of service. [Read the notes from the security team](https://ubuntu.com/security/CVE-2015-5180#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | eglibc | 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 | | 17.04 zesty | Not in release | | 16.10 yakkety | Not in release | | 16.04 LTS xenial | Not in release | | 15.10 wily | Not in release | | 15.04 vivid | Not in release | | 14.04 LTS trusty | Ignored end of standard support | | 12.04 LTS precise | Ignored end of life | | glibc | 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 | | 17.10 artful | Ignored end of life | | 17.04 zesty | Ignored end of life | | 16.10 yakkety | Ignored end of life | | 16.04 LTS xenial | Ignored | | 15.10 wily | Ignored end of life | | 15.04 vivid | Ignored end of life | | 14.04 LTS trusty | Not in release | | 12.04 LTS precise | 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-2015-5180#patch-details) ## Notes --- ### [tyhicks](https://launchpad.net/~tyhicks) See test case in the bug no fix upstream as of 2016-09-09 --- ### [sbeattie](https://launchpad.net/~sbeattie) patch committed upstream on 2016-12-31; renames symbol so backporting may not be easy. commit included in glibc 2.25 release debian fixed this in unstable in 2.24-9 fixing this does indeed break the internal ABI between libnss\_dns and libresolv. We're backing out this change. reverted from zesty in 2.24-9ubuntu2 by infinity. For existing releases, DO NOT APPLY THIS PATCH due to ABI breakage. Fix will come in to 17.10 when we get glibc-2.25 as we do not guarantee ABI for libresolv internals across different glibc releases, just for upgrades for same versions e.g. (2.24 -> 2.24) REPEAT: DO NOT APPLY THIS PATCH (UNMODIFIED) IN A STABLE RELEASE --- ### [mdeslaur](https://launchpad.net/~mdeslaur) marking this issue as ignored, as we will not be fixing this in Ubuntu stable releases. ### 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 | | --- | --- | | glibc | * Upstream: * Upstream: | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.5 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | High | * Scores | Parameter | Value | | --- | --- | | Base score | 7.5 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5180) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-5180) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-5180) * [Debian](https://security-tracker.debian.org/tracker/CVE-2015-5180) ### Related Ubuntu Security Notices (USN) + [USN-3239-1](https://usn.ubuntu.com/USN-3239-1) + GNU C Library vulnerabilities + 21 March 2017 ### Other references *