Is CVE-2020-21050 in the CISA KEV catalog?

No. CVE-2020-21050 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-21050?

CVE-2020-21050 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2020-21050?

CVE-2020-21050 has an EPSS score of 1.50% (71th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-21050?

Upgrade libsixel on debian 11 to 1.8.6-1 or later.

CVE & CISA-KEV Catalog

CVE-2020-21050

MEDIUMEPSS 71th pctl

6.5

CVSS v3

NVD

Description

Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

libsixelDebian

Fixed in:1.8.6-1CVE-2020-21050

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.50%probability of exploitation in 30 days

71stpercentile

Elevated risk: more likely to be exploited than 71% of all known CVEs.

References

Patch2

Third-Party Advisory2

Technical Description1

cwe.mitre.org

Other references1

bitbucket.org

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-2020-21050

Markdown

[![CVE-2020-21050](https://tridentstack.com/cve/badge/CVE-2020-21050.svg)](https://tridentstack.com/cve/CVE-2020-21050)

HTML

<a href="https://tridentstack.com/cve/CVE-2020-21050"><img src="https://tridentstack.com/cve/badge/CVE-2020-21050.svg" alt="CVE-2020-21050"></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 2026-04-24.