Is CVE-2021-39537 in the CISA KEV catalog?

No. CVE-2021-39537 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39537?

CVE-2021-39537 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-39537?

CVE-2021-39537 has an EPSS score of 3.00% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39537?

Upgrade ncurses on debian 11 to 6.2+20200912-1 or later. Fixes are available for 23 affected products.

CVE & CISA-KEV Catalog

CVE-2021-39537

HIGHEPSS 86th pctl

8.8

CVSS v3

NVD

Description

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

CWE-787Out-of-bounds Write

How to fix

Remediation Available

ncursesDebian

Fixed in:6.2+20200912-1CVE-2021-39537

lib32ncurses5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

lib32ncurses6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

lib32ncursesw5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

lib32ncursesw6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

lib32tinfo5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

lib32tinfo6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

lib64ncurses5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

lib64ncurses6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

lib64ncursesw6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

lib64tinfo5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

lib64tinfo6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libncurses5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm2USN-5477-1

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm2USN-5477-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libncurses6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libncursesw5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libncursesw6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libtinfo5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm2USN-5477-1

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm2USN-5477-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libtinfo6Ubuntu

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

libx32ncurses5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

libx32ncursesw5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

libx32tinfo5Ubuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

ncursesUbuntu

Fixed in:5.9+20140118-1ubuntu1+esm2USN-5477-1

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm2USN-5477-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

ncurses-binUbuntu

Fixed in:5.9+20140118-1ubuntu1+esm3USN-6099-1

Fixed in:5.9+20140118-1ubuntu1+esm2USN-5477-1

Fixed in:6.0+20160213-1ubuntu1+esm3USN-6099-1

Fixed in:6.0+20160213-1ubuntu1+esm2USN-5477-1

Fixed in:6.1-1ubuntu1.18.04.1USN-6099-1

Fixed in:6.2-0ubuntu2.1USN-6099-1

Fixed in:6.3-2ubuntu0.1USN-6099-1

Fixed in:6.3+20220423-2ubuntu0.1USN-6099-1

Fixed in:6.4-2ubuntu0.1USN-6099-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

3.00%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Patch1

cvsweb.netbsd.org

Exploit1

lists.gnu.org

Vendor Advisory1

lists.gnu.org

Third-Party Advisory7

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

Embed a live status badge for CVE-2021-39537

Markdown

[![CVE-2021-39537](https://tridentstack.com/cve/badge/CVE-2021-39537.svg)](https://tridentstack.com/cve/CVE-2021-39537)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-39537"><img src="https://tridentstack.com/cve/badge/CVE-2021-39537.svg" alt="CVE-2021-39537"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.