CVE•Published 2019-12-20•Modified 2026-05-28•1 article on news•5 live references•NVD data
CVE-2019-17571Apache · Log4j
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
97
Exploit Prediction Scoring System · top 3% of all CVEs
Weaknesses (CWE)
Description
Included in Log4j 1.2 is a SocketServer class that is vulnerable to deserialization of untrusted data which can be exploited to remotely execute arbitrary code when combined with a deserialization gadget when listening to untrusted network traffic for log data. This affects Log4j versions up to 1.2 up to 1.2.17.
Timeline
Published 2019-12-20
Modified 2026-05-28
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 tag34 hosts
vuln:CVE-2019-17571Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Apache Log4j"All exposed Apache Log4j instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Log4j"HTTP body or banner mentions "Log4j" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2019-17571Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2019-17571Censys host search filtered to this CVE id.
grep.app
CVE-2019-17571Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2019-17571GitHub code search for direct mentions.
Google dork
"CVE-2019-17571" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.