CVE-2020-9366

Publication date 24 February 2020

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A buffer overflow was found in the way GNU Screen before 4.8.0 treated the special escape OSC 49. Specially crafted output, or a special program, could corrupt memory and crash Screen or possibly have unspecified other impact.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
screen	19.10 eoan	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

leosilva

vulnerable code introduced in v4.7.0 introduced by https://git.savannah.gnu.org/cgit/screen.git/commit/?id=c5db181b6e017cfccb8d7842ce140e59294d9f62

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
screen	Upstream: ?id=683 Upstream: ?id=0dd

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