CVE-2021-39537

Publication date 20 September 2021

Last updated 25 August 2025

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

An issue was discovered in ncurses through v6.2-1. _nc_captoinfo in captoinfo.c has a heap-based buffer overflow.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ncurses	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 6.2-0ubuntu2.1
	18.04 LTS bionic	Fixed 6.1-1ubuntu1.18.04.1
	16.04 LTS xenial	Fixed 6.0+20160213-1ubuntu1+esm2
	14.04 LTS trusty	Fixed 5.9+20140118-1ubuntu1+esm2

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Notes

mdeslaur

read of size 1, DoS only

Patch details

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

Package	Patch details
ncurses	Upstream: 790a85d

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H