Vulnerability Intelligence Report
Apache Flink directory traversal attack: remote file writing through the REST API
CVE-2020-17518
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.
Nuclei Template
CVSS Base Score
7.5
HIGH
EPSS Probability:52.33%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
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SSVC Action
—
Weaknesses (CWE)
CWE-23 ↗CWE-23 Relative Path Traversal
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Apache Software Foundation | Apache Flink | Apache Flink 1.5.1 to 1.11.2 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Apache Software Foundation · Vendor · USA |
| Reserved | 2020-08-12T00:00:00 |
| Published | 2021-01-05T11:40:13 |
| Last Updated | 2025-02-13T16:27:34 |
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