CVE-2021-26937

Publication date 9 February 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
screen	21.04 hirsute	Not affected
	20.10 groovy	Fixed 4.8.0-2ubuntu0.1
	20.04 LTS focal	Fixed 4.8.0-1ubuntu0.1
	18.04 LTS bionic	Fixed 4.6.2-1ubuntu1.1
	16.04 LTS xenial	Fixed 4.3.1-2ubuntu0.1
	14.04 LTS trusty	Fixed 4.1.0~20120320gitdb59704-9ubuntu0.1~esm2 Ubuntu Pro

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Notes

mdeslaur

as of 2021-02-18, proposed patch on mailing list not yet commited to upstream repo, but has been released by Debian

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H