Public proof of conceptFix available

CVE-2019-17571

A public proof of concept exists; no exploitation attested.

Published2019-12-20
WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC

2019-12-2017:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-17571?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-17571?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Oracle weblogic server

Branch	Affected	Fixed in	Source
10.3	= 10.3.6.0.0	no fix published	NVD
12.1	= 12.1.3.0.0	no fix published	NVD
12.2	= 12.2.1.3.0	no fix published	NVD
12.2	= 12.2.1.4.0	no fix published	NVD
14.1	= 14.1.1.0.0	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
8.0	= 8.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD

Oracle retail service backbone

Branch	Affected	Fixed in	Source
14.1	= 14.1	no fix published	NVD
15.0	= 15.0	no fix published	NVD
16.0	= 16.0	no fix published	NVD

16 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 3 repositories, unverifiedshadow-horse/CVE-2019-17571Al1ex/CVE-2019-17571HynekPetrak/log4shell-finder

Sources

CISA-ADPSSVC decisionnone2026-05-28
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.19.82026-05-28
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-5022026-05-28
CNAweakness (CWE)CWE-502read 2026-10-23
NVDweakness (CWE)CWE-502read 2026-10-23
FIRST EPSSEPSS score70.0 %read 2026-10-23
PoC-in-GitHubproof of concept3read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2019-12-20
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-17571?

Is CVE-2019-17571 actively exploited?

Active exploitation of CVE-2019-17571 has not been confirmed. Its EPSS score was 70.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-17571?

CVE-2019-17571 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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