---
title: "CVE-2017-3204\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-2017-3204?format=md
keywords: index, follow
---
# CVE-2017-3204
Publication date 4 April 2017
Last updated 11 July 2025
---
Ubuntu priority
**Low**
[Why this priority?](https://ubuntu.com/security/cves/about#priority )
## Cvss 3 Severity Score
**8.1 · High**
[Score breakdown](https://ubuntu.com/security/CVE-2017-3204?format=md#impact-score)
Toggle side navigation
## Description
The Go SSH library (x/crypto/ssh) by default does not verify host keys,
facilitating man-in-the-middle attacks. Default behavior changed in commit
e4e2799 to require explicitly registering a hostkey verification mechanism.
[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-3204?format=md#notes)
## Status
Show unmaintained releases
| Package | Ubuntu Release | Status |
| --- | --- | --- |
| snapd | 26.04 LTS resolute | Ignored code not used |
| 25.10 questing | Ignored end of life, was ignored [code not used] |
| 25.04 plucky | Ignored end of life, was ignored [code not used] |
| 24.10 oracular | Ignored end of life, was ignored [code not used] |
| 24.04 LTS noble | Ignored code not used |
| 23.10 mantic | Ignored end of life, was ignored [code not used] |
| 23.04 lunar | Ignored end of life, was ignored [code not used] |
| 22.10 kinetic | Ignored end of life, was ignored [code not used] |
| 22.04 LTS jammy | Ignored code not used |
| 21.10 impish | Ignored end of life |
| 21.04 hirsute | Ignored end of life |
| 20.10 groovy | Ignored end of life |
| 20.04 LTS focal | Ignored end of standard support, was ignored [code not used] |
| 19.10 eoan | Ignored end of life |
| 19.04 disco | Ignored end of life |
| 18.10 cosmic | Ignored end of life |
| 18.04 LTS bionic | Ignored end of standard support |
| 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 end of standard support |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |
| golang-go.crypto | 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 | 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 | Vulnerable |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |
| ubuntu-snappy | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 25.04 plucky | Not in release |
| 24.10 oracular | Not in release |
| 24.04 LTS noble | Not in release |
| 23.10 mantic | Not in release |
| 23.04 lunar | Not in release |
| 22.10 kinetic | Not in release |
| 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 |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 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-2017-3204?format=md#patch-details)
## Notes
---
### [jdstrand](https://launchpad.net/~jdstrand)
ubuntu-snappy and snapd contain embedded copies of golang-go.crypto
---
### [tyhicks](https://launchpad.net/~tyhicks)
snapd doesn't use this particular part of golang-go.crypto as it
doesn't act as a SSH client
### 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 |
| --- | --- |
| golang-go.crypto | * Upstream: [e4e2799](https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991) |
## Severity score breakdown
CVSS version:
CVSS v3.0
**Base score**
8.1 · High
* Base metrics
| Parameter | Value |
| --- | --- |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | High |
* Scores
| Parameter | Value |
| --- | --- |
| Base score | 8.1 · High |
| Exploitability score | - |
| Impact score | - |
**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
## References
* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3204)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-3204)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-3204)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-3204)
### Other references
*
*
*