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Tool Directory

CVE-2020-17518

HighPublished

Apache Flink directory traversal attack: remote file writing through the REST API

Published: Jan 5, 2021
Updated: Feb 13, 2025
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS probability estimate

50.0%

High · next 30 days

Percentile: 98.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.

Sources

CVE-2020-17518PoC
[CVE-2020-17518] Apache Flink RESTful API Arbitrary File Upload via Directory Traversal
CVE-2020-17518Exploit
Python exploit for CVE-2020-17518, allowing arbitrary file write via Apache Flink REST API. Supports single target and batch scanning from a file.
Flink-CVE-2020-17518-getshellExploit
利用Apache Flink CVE-2020-17518 getshell

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