CVE-2020-17518
7.5 · HIGHOverview
CVE-2020-17518 is a high-severity vulnerability affecting apache flink. It was published on January 5, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from apache. Update flink to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| apache | flink | >= 1.5.1, < 1.11.3 | Affected |
References
Frequently Asked Questions
What is CVE-2020-17518?
CVE-2020-17518 is a high-severity vulnerability affecting apache flink. It was published on January 5, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2020-17518?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2020-17518?
Check the references section for vendor advisories and patches from apache. Update flink to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-17518?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-17518 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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