CVE•Published 2022-04-08•Modified 2026-04-24•1 article on news•6 live references•NVD data
CVE-2021-40656Libsixel · 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)
Description
libsixel before 1.10 is vulnerable to Buffer Overflow in libsixel/src/quant.c:867.
Timeline
Published 2022-04-08
Modified 2026-04-24
External references
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-2021-40656Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Libsixel Libsixel"All exposed Libsixel Libsixel instances — cross-reference with the CVE's affected-version range.
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-2021-40656Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-40656Censys host search filtered to this CVE id.
grep.app
CVE-2021-40656Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-40656GitHub code search for direct mentions.
Google dork
"CVE-2021-40656" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2021-40656 on GitHub.