---
title: "CVE-2017-9103\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-2017-9103?format=md
keywords: index, follow
---

# CVE-2017-9103

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

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2017-9103?format=md#impact-score)

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## Description

An issue was discovered in adns before 1.5.2. pap\_mailbox822 does not
properly check st from adns\_\_findlabel\_next. Without this, an uninitialised
stack value can be used as the first label length. Depending on the
circumstances, an attacker might be able to trick adns into crashing the
calling program, leaking aspects of the contents of some of its memory,
causing it to allocate lots of memory, or perhaps overrunning a buffer.
This is only possible with applications which make non-raw queries for SOA
or RP records.

## 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**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9103)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-9103)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-9103)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-9103)

### Other references

* <http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=commit;h=020d86e2eccc2dbdfa9dcca08ddb327cc7ca3ae2>
* <https://www.cve.org/CVERecord?id=CVE-2017-9103>