CVE•Published 2021-09-17•Modified 2026-04-24•1 article on news•5 live references•NVD data

CVE-2020-21547Saitoha · Libsixel

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

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

EPSS percentile

—

Weaknesses (CWE)

CWE-787Out-of-bounds Write

Description

Libsixel 1.8.2 contains a heap-based buffer overflow in the dither_func_fs function in tosixel.c.

Timeline

Published 2021-09-17

Modified 2026-04-24

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2020-21547

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product + version

product:"Saitoha Libsixel" version:"1.8.2"

Version-pinned fingerprint from NVD's first vulnerable CPE.

Shodan · banner/body mention

http.html:"Libsixel"

HTTP body or banner mentions "Libsixel" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2020-21547

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2020-21547

Censys host search filtered to this CVE id.

grep.app

CVE-2020-21547

Public source-code mentions — fast PoC discovery.

GitHub code

CVE-2020-21547

GitHub code search for direct mentions.

Google dork

"CVE-2020-21547" exploit -site:nvd.nist.gov

Write-ups and news, NVD excluded.

Known PoCs on GitHub

No public proof-of-concept repositories found for CVE-2020-21547 on GitHub.