---
title: "CVE-2017-9107\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-2017-9107?format=md
keywords: index, follow
---

# CVE-2017-9107

Publication date 18 June 2020

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-9107?format=md#impact-score)

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## Description

An issue was discovered in adns before 1.5.2. It overruns reading a buffer
if a domain ends with backslash. If the query domain ended with \, and
adns\_qf\_quoteok\_query was specified, qdparselabel would read additional
bytes from the buffer and try to treat them as the escape sequence. It
would depart the input buffer and start processing many bytes of arbitrary
heap data as if it were the query domain. Eventually it would run out of
input or find some other kind of error, and declare the query domain
invalid. But before then it might outrun available memory and crash. In
principle this could be a denial of service attack.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| adns | 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 | Vulnerable |
| 19.10 eoan | Ignored end of life |
| 18.04 LTS bionic | Vulnerable |
| 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**

7.5 · 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:3.1/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-2017-9107)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-9107)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-9107)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-9107)

### Other references

* <http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=commit;h=278f8eee581c4c4a0ddd0f98c4dc8c2974cf6b90>
* <https://www.cve.org/CVERecord?id=CVE-2017-9107>