CVE-2020-28476

Publication date 18 January 2021

Last updated 4 August 2025

Ubuntu priority

Cvss 3 Severity Score

Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2021-23336. Reason: This candidate is a reservation duplicate of CVE-2021-23336. Notes: All CVE users should reference CVE-2021-23336 instead of this candidate. All references and descriptions in this candidate have been removed to prevent accidental usage

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-tornado	20.10 groovy	Ignored end of life, was deferred
	20.04 LTS focal	Vulnerable, fix deferred
	18.04 LTS bionic	Vulnerable, fix deferred
	16.04 LTS xenial	Vulnerable, fix deferred
	14.04 LTS trusty	Not in release
python-tornado4	20.10 groovy	Not in release
	20.04 LTS focal	Vulnerable, fix deferred
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release

Notes

mdeslaur

per tornado developers, this isn't an issue in tornado itself, but in the python standard library. as of 2021-01-29, no details on possible fix from upstream

Severity score breakdown

Parameter	Value
Base score	6.8 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H