---
title: "CVE-2020-9283\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-2020-9283?format=md
keywords: index, follow
---

# CVE-2020-9283

Publication date 20 February 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-2020-9283?format=md#impact-score)

Toggle side navigation

## Description

golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975 for Go allows
a panic during signature verification in the golang.org/x/crypto/ssh
package. A client can attack an SSH server that accepts public keys. Also,
a server can attack any SSH client.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2020-9283?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| 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 | Ignored end of life |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Not in release |
| lxd | 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 |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| mongo-tools | 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 | Needs evaluation |
| 19.10 eoan | Ignored end of life |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| snapd | 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 |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2020-9283?format=md#patch-details)

## Notes

---

### [jdstrand](https://launchpad.net/~jdstrand)

snapd contains an embedded copy of golang-go.crypto
lxd in 18.04 LTS and earlier contains an embedded copy of
golang-go.crypto

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

snapd and lxd only use the terminal sub-package, not the ssh
part of golang-go.crypto, so they are not vulnerable

### 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:   [bac4c82](https://github.com/golang/crypto/commit/bac4c82f69751a6dd76e702d54b3ceb88adab236) |

## 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-2020-9283)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2020-9283)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2020-9283)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2020-9283)

### Other references

* <http://packetstormsecurity.com/files/156480/Go-SSH-0.0.2-Denial-Of-Service.html>
* <https://groups.google.com/forum/#!topic/golang-announce/3L45YRc91SY>
* <https://www.cve.org/CVERecord?id=CVE-2020-9283>