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CVE-2020-17519

Apache Flink directory traversal attack: reading remote files through the REST API

  • Critical 9.1
  • Exploited: added to CISA KEV 23 May 2024

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.

Key facts

Published
5 Jan 2021
Last changed
21 Oct 2025
Assigned by
apache
KEV added
23 May 2024
KEV fix due
13 Jun 2024
EPSS
98.001% likely to be exploited in the next 30 days, higher than 99.91% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.1CVSS 3.1, Criticalfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

What to do

  • Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
Apache Software FoundationApache Flink
  • Apache Flink 1.11.0 to 1.11.2 (affected)

Timeline

  1. 5 Jan 2021 Published
  2. 23 May 2024 CVE-2020-17519 added to CISA KEV
  3. 23 May 2024 Added to the CISA KEV catalogue

Weakness

References