CVE-2020-17518— Apache Flink directory traversal attack: remote file writing through the REST API
Quick assessment
Affected
Apache Software Foundation Apache Flink
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Apache Flink是美国阿帕奇软件（Apache）基金会的一款开源的分布式流数据处理引擎。该产品主要使用Java和Scala语言编写。 Apache Flink 1.5.1 存在安全漏洞，该漏洞源于一个REST处理程序允许攻击者通过恶意修改的HTTP头将上传的文件写入到本地文件系统上的任意位置。
Public Exploits 1
Nuclei · 1
CVE-2020-17518.yaml [template]
Possible ATT&CK Techniques 1 AI
T1105 · Ingress Tool Transfer
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2020-17518
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Apache Flink directory traversal attack: remote file writing through the REST API
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Flink 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Flink是美国阿帕奇软件（Apache）基金会的一款开源的分布式流数据处理引擎。该产品主要使用Java和Scala语言编写。 Apache Flink 1.5.1 存在安全漏洞，该漏洞源于一个REST处理程序允许攻击者通过恶意修改的HTTP头将上传的文件写入到本地文件系统上的任意位置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Flink | Apache Flink 1.5.1 to 1.11.2 | - |
|
II. Public POCs for CVE-2020-17518
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | None | https://github.com/QmF0c3UK/CVE-2020-17518 | POC Details |
| 2 | [CVE-2020-17518] Apache Flink RESTful API Arbitrary File Upload via Directory Traversal | https://github.com/murataydemir/CVE-2020-17518 | POC Details |
| 3 | 利用Apache Flink CVE-2020-17518 getshell | https://github.com/rakjong/Flink-CVE-2020-17518-getshell | POC Details |
| 4 | Apache Flink 1.5.1 is vulnerable to local file inclusion because of a REST handler that allows file uploads to an arbitrary location on the local file system through a maliciously modified HTTP HEADER. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-17518.yaml | POC Details |
| 5 | None | https://github.com/Threekiii/Awesome-POC/blob/master/%E5%BC%80%E5%8F%91%E6%A1%86%E6%9E%B6%E6%BC%8F%E6%B4%9E/Apache%20Flink%20%E5%B0%8F%E4%BA%8E1.9.1%E8%BF%9C%E7%A8%8B%E4%BB%A3%E7%A0%81%E6%89%A7%E8%A1%8C%20CVE-2020-17518.md | POC Details |
| 6 | https://github.com/vulhub/vulhub/blob/master/flink/CVE-2020-17518/README.md | POC Details |
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2020-17518
请登录查看更多情报信息。
Mailing List Discussions for CVE-2020-17518 (22)
-
https://lists.apache.org/thread.html/ra8c96bf3ccb4e491f9ce87ba35f134b4449beb2a38d1ce28fd89001f%40%3Cdev.flink.apache.org%3E mailing-list x_refsource_MLIST
-
https://lists.apache.org/thread.html/r229167538863518738e02f4c1c5a8bb34c1d45dadcc97adf6676b0c1%40%3Cdev.flink.apache.org%3E mailing-list x_refsource_MLIST
-
https://lists.apache.org/thread.html/rd2467344f88bcaf108b8209ca92da8ec393c68174bfb8c27d1e20faa%40%3Cdev.flink.apache.org%3E mailing-list x_refsource_MLIST
-
https://lists.apache.org/thread.html/r1125f3044a0946d1e7e6f125a6170b58d413ebd4a95157e4608041c7%40%3Cannounce.apache.org%3E mailing-list x_refsource_MLIST
-
https://lists.apache.org/thread.html/rd6a1a0e2d73220a65a8f6535bbcd24bb66adb0d046c4a1aa18777cf3%40%3Cdev.flink.apache.org%3E mailing-list x_refsource_MLIST
-
https://lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2acbfef261%40%3Cannounce.apache.org%3E mailing-list x_refsource_MLIST
-
https://lists.apache.org/thread.html/rb43cd476419a48be89c1339b527a18116f23eec5b6df2b2acbfef261%40%3Cuser.flink.apache.org%3E mailing-list x_refsource_MLIST
-
IV. Related Vulnerabilities
Same vendor: Apache Software Foundation
-
CVE-2026-108743
Apache Kylin: spark job OS command injection -
CVE-2026-108709
Apache Kylin: Unauthenticated Metadata Broadcast (inside in- -
CVE-2026-69080
Apache Kylin: Broken Access Control in QuerySQLBlacklistCont -
CVE-2026-69077
Apache Kylin: JobController allows unauthorized cross-projec -
CVE-2026-69076
Apache Kylin: Unauthorized cross-project job discard
Same weakness: CWE-23
-
CVE-2026-111093
JetBrains Datalore <2026.2.1 未授权路径穿越漏洞 -
CVE-2026-103508
Path traversal via logging configuration in P4Search -
CVE-2026-41545
WebSocket timelapse path traversal and command injection -
CVE-2026-39993
Path Traversal to Root RCE in QNAP Download Station via Addo -
CVE-2026-76519
Cisco Secure Email Gateway Arbitrary File Write Vulnerabilit
V. Comments for CVE-2020-17518
No comments yet