--- title: "CVE-2020-17519: Apache Flink directory traversal attack… | CubePath" description: "A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem…" language: en source: https://cubepath.com/security/cve/CVE-2020-17519 --- # CVE-2020-17519: Apache Flink directory traversal attack… | CubePath ## Description A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process. Access is restricted to files accessible by the JobManager process. 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 b561010b0ee741543c3953306037f00d7a9f0801 from apache/flink:master. Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-17519) ## Key data ### CVSS 3.1 Critical 9.1 Score published by CISA-ADP in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.98001 (98.0% probability) Percentile 99.9% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Apache Flink Improper Access Control Vulnerability Added to the catalog May 23, 2024 Federal due date Jun 13, 2024 ### CISA assessment as of May 24, 2024 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact partial ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-552](https://cwe.mitre.org/data/definitions/552.html) Files or Directories Accessible to External Parties ## Affected products Products listed in the CVE record, as the CNA published them. - Apache Flink - affected: Apache Flink 1.11.0 to 1.11.2 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [lists.apache.org/thread.html/r6843202556a6d0bce9607ebc02e30…](https://lists.apache.org/thread.html/r6843202556a6d0bce9607ebc02e303f68fc88e9038235598bde3b50d%40%3Cdev.flink.apache.org%3E) - [\[flink-user\] 20210105 \[CVE-2020-17519\] Apache Flink directory traversal attack: reading remote files through the REST API](https://lists.apache.org/thread.html/r6843202556a6d0bce9607ebc02e303f68fc88e9038235598bde3b50d%40%3Cuser.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[announce\] 20210105 \[CVE-2020-17519\] Apache Flink directory traversal attack: reading remote files through the REST API](https://lists.apache.org/thread.html/r6843202556a6d0bce9607ebc02e303f68fc88e9038235598bde3b50d%40%3Cannounce.apache.org%3E) (lists.apache.org) mailing-list - [\[oss-security\] 20210105 \[CVE-2020-17519\] Apache Flink directory traversal attack: reading remote files through the REST API](http://www.openwall.com/lists/oss-security/2021/01/05/2) (openwall.com) mailing-list - [\[flink-issues\] 20210106 \[GitHub\] \[flink-web\] zentol commented on a change in pull request #408: Add security page for Flink](https://lists.apache.org/thread.html/r28f17e564950d663e68cc6fe75756012dda62ac623766bb9bc5e7034%40%3Cissues.flink.apache.org%3E) (lists.apache.org) mailing-list - [packetstormsecurity.com/files/160849/Apache-Flink-1.11.0-Ar…](http://packetstormsecurity.com/files/160849/Apache-Flink-1.11.0-Arbitrary-File-Read-Directory-Traversal.html) - [\[flink-issues\] 20210110 \[jira\] \[Updated\] (FLINK-20916) Typo in test for CVE-2020-17519](https://lists.apache.org/thread.html/r2fc60b30557e4a537c2a6293023049bd1c49fd92b518309aa85a0398%40%3Cissues.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[flink-dev\] 20210110 \[jira\] \[Created\] (FLINK-20916) Typo in test for CVE-2020-17519](https://lists.apache.org/thread.html/r4e1b72bfa789ea5bc20b8afe56119200ed25bdab0eb80d664fa5bfe2%40%3Cdev.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[flink-issues\] 20210110 \[jira\] \[Created\] (FLINK-20916) Typo in test for CVE-2020-17519](https://lists.apache.org/thread.html/r0a433be10676f4fe97ca423d08f914e0ead341c901216f292d2bbe83%40%3Cissues.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[flink-issues\] 20210111 \[jira\] \[Assigned\] (FLINK-20916) Typo in test for CVE-2020-17519](https://lists.apache.org/thread.html/r88b55f3ebf1f8f4e1cc61f030252aaef4b77060b56557a243abb92a1%40%3Cissues.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[flink-issues\] 20210111 \[jira\] \[Commented\] (FLINK-20916) Typo in test for CVE-2020-17519](https://lists.apache.org/thread.html/r88f427865fb6aa6e6378efe07632a1906b430365e15e3b9621aabe1d%40%3Cissues.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[flink-dev\] 20210113 Re: \[DISCUSS\] Releasing Apache Flink 1.10.3](https://lists.apache.org/thread.html/ra8c96bf3ccb4e491f9ce87ba35f134b4449beb2a38d1ce28fd89001f%40%3Cdev.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[flink-dev\] 20210115 Re: \[DISCUSS\] Releasing Apache Flink 1.10.3](https://lists.apache.org/thread.html/r229167538863518738e02f4c1c5a8bb34c1d45dadcc97adf6676b0c1%40%3Cdev.flink.apache.org%3E) (lists.apache.org) mailing-list - [\[announce\] 20210125 Apache Software Foundation Security Report: 2020](https://lists.apache.org/thread.html/r90890afea72a9571d666820b2fe5942a0a5f86be406fa31da3dd0922%40%3Cannounce.apache.org%3E) (lists.apache.org) mailing-list - [\[announce\] 20210223 Re: Apache Software Foundation Security Report: 2020](https://lists.apache.org/thread.html/r1125f3044a0946d1e7e6f125a6170b58d413ebd4a95157e4608041c7%40%3Cannounce.apache.org%3E) (lists.apache.org) mailing-list - [lists.apache.org/thread.html/r26fcdd4fe288323006253437ebc4d…](https://lists.apache.org/thread.html/r26fcdd4fe288323006253437ebc4dd6fdfadfb5e93465a0e4f68420d%40%3Cuser-zh.flink.apache.org%3E) ## Timeline 1. ID reserved Aug 12, 2020 2. Record published Jan 5, 2021 3. Added to CISA KEV May 23, 2024 4. Record last updated Oct 21, 2025 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:23 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)