CVE•Published 2020-01-29•Modified 2026-10-08•1 article on news•5 live references•NVD data
CVE-2019-20444Netty · Netty
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
95
Exploit Prediction Scoring System · top 5% of all CVEs
Weaknesses (CWE)
Description
HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."
Timeline
Published 2020-01-29
Modified 2026-10-08
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 tag74 hosts
vuln:CVE-2019-20444Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Netty Netty"All exposed Netty Netty instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Netty"HTTP body or banner mentions "Netty" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2019-20444Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2019-20444Censys host search filtered to this CVE id.
grep.app
CVE-2019-20444Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2019-20444GitHub code search for direct mentions.
Google dork
"CVE-2019-20444" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.