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Public proof of conceptFix available

CVE-2017-5645

A public proof of concept exists; no exploitation attested.

  • Published2017-04-17
  • 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

In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another application, a specially crafted binary payload can be sent that, when deserialized, can execute arbitrary code.

Timeline

dates in UTC
  1. 2017-04-1721:59CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub
  3. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2017-5645?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-5645?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Oracle policy automation
BranchAffectedFixed in
10.4= 10.4.7no fix published
12.1= 12.1.0no fix published
12.1= 12.1.1no fix published
12.2= 12.2.0no fix published
12.2= 12.2.1no fix published
12.2= 12.2.2no fix published
12.2= 12.2.3no fix published
12.2= 12.2.4no fix published
12.2= 12.2.5no fix published
12.2= 12.2.6no fix published
12.2= 12.2.7no fix published
12.2= 12.2.8no fix published
Oracle policy automation for mobile devices
BranchAffectedFixed in
10.4= 10.4.7no fix published
12.1= 12.1.0no fix published
12.1= 12.1.1no fix published
12.2= 12.2.0no fix published
12.2= 12.2.1no fix published
12.2= 12.2.2no fix published
12.2= 12.2.3no fix published
12.2= 12.2.4no fix published
12.2= 12.2.5no fix published
12.2= 12.2.6no fix published
12.2= 12.2.7no fix published
12.2= 12.2.8no fix published
Redhat enterprise linux
BranchAffectedFixed in
6.0= 6.0no fix published
6.7= 6.7no fix published
7.0= 7.0no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.5= 7.5no fix published
7.6= 7.6no fix published

76 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
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedpimps/CVE-2017-5645HynekPetrak/log4shell-finder
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-10-08
  • OpenCVESSVC decisionnone—
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score89.8 %read 2026-10-23
  • PoC-in-GitHubproof of concept2read 2026-10-23

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
2017-04-17
Last Modified
2026-10-08
NVD status
Modified

Frequently asked questions

What is CVE-2017-5645?

In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another application, a specially crafted binary payload can be sent that, when deserialized, can execute arbitrary code.

Is CVE-2017-5645 actively exploited?

Active exploitation of CVE-2017-5645 has not been confirmed. Its EPSS score was 89.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-5645?

CVE-2017-5645 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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