Ubuntu Security Notices

Developers issue an Ubuntu Security Notice when a security issue is fixed in an official Ubuntu package. You can find additional guidance for high-profile vulnerabilities in the Ubuntu Vulnerability Knowledge Base section.

To report a security vulnerability in an Ubuntu package, please contact the Security Team.

The Security Team also produces OVAL files for each Ubuntu release. These are an industry-standard machine-readable format dataset that contain details of all known security vulnerabilities and fixes relevant to the Ubuntu release, and can be used to determine whether a particular patch is appropriate. OVAL files can also be used to audit a system to check whether the latest security fixes have been applied.

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USN-4975-1: Django vulnerabilities

2 June 2021

Several security issues were fixed in Django.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-32052, CVE-2021-33571, CVE-2021-33203

USN-4974-1: Lasso vulnerability

2 June 2021

Applications using Lasso could be made to allow unintended access.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-28091

USN-4973-1: Python vulnerability

1 June 2021

Python could allow unintended access to network services.

  • Ubuntu 20.10 ,
  • 20.04 LTS

CVE ID

CVE-2021-29921

USN-4972-1: PostgreSQL vulnerabilities

1 June 2021

Several security issues were fixed in PostgreSQL.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-32029, CVE-2021-32028, CVE-2021-32027

USN-4971-1: libwebp vulnerabilities

1 June 2021

libwebp could be made to crash or run programs as your login if it opened a specially crafted file.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2020-36331, CVE-2018-25010, CVE-2018-25011 + 8 others

USN-4970-1: GUPnP vulnerability

1 June 2021

GUPnP could allow unintended access to network services.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS

CVE ID

CVE-2021-33516

USN-4969-1: DHCP vulnerability

27 May 2021

DHCP could be made to crash if it received specially crafted network traffic.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-25217

USN-4968-1: LZ4 vulnerability

26 May 2021

LZ4 could be made to crash or run programs if it opened a specially crafted file.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-3520

USN-4967-1: nginx vulnerability

26 May 2021

nginx could be made to crash or run programs if it received specially crafted network traffic.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-23017

USN-4966-1: libx11 vulnerability

25 May 2021

libx11 could allow unintended access to services.

  • Ubuntu 21.04 ,
  • 20.10 ,
  • 20.04 LTS,
  • 18.04 LTS

CVE ID

CVE-2021-31535

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