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TI-2020-13268 Aliases CVE-2020-17519GHSA-395w-qhqr-9fr6

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

Priority CRITICAL 96Exploited in the wildCWE-552Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-552.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2024-05-23CISA due date 2024-06-13
EPSS 0.98001 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed org.apache.flink:flink-runtime_2.11 (Maven): 1.11.3org.apache.flink:flink-runtime_2.12 (Maven): 1.11.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache FlinkApache Flink 1.11.0 to 1.11.2—No fix listedCNA
—org.apache.flink:flink-runtime_2.11 (Maven)1.11.0 to before 1.11.31.11.3Patch availableGHSA-395w-qhqr-9fr6
—org.apache.flink:flink-runtime_2.12 (Maven)1.11.0 to before 1.11.31.11.3Patch availableGHSA-395w-qhqr-9fr6
  • Apache Flink VendorApache Affected Apache Flink 1.11.0 to 1.11.2 Fixed in — No fix listed CNA
  • org.apache.flink:flink-runtime_2.11 (Maven) Vendor— Affected 1.11.0 to before 1.11.3 Fixed in 1.11.3 Patch available GHSA-395w-qhqr-9fr6
  • org.apache.flink:flink-runtime_2.12 (Maven) Vendor— Affected 1.11.0 to before 1.11.3 Fixed in 1.11.3 Patch available GHSA-395w-qhqr-9fr6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:flink:*:*:*:*:*:*:*:*1.11.0 to before 1.11.3VulnerableApache
  • cpe:2.3:a:apache:flink:*:*:*:*:*:*:*:* Versions 1.11.0 to before 1.11.3 Vulnerable ·Apache

Remediation

  • Fix · GHSA-395w-qhqr-9fr6 org.apache.flink:flink-runtime_2.11 (Maven) Fixed in 1.11.3 Advisory →
  • Fix · GHSA-395w-qhqr-9fr6 org.apache.flink:flink-runtime_2.12 (Maven) Fixed in 1.11.3 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 2 products
  • Red Hat Fuse 7
  • Red Hat Integration Camel K 1

Timeline

  1. 2024-05-23 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2020-17519
  3. 2026-10-03 Alias added: GHSA-395w-qhqr-9fr6

References

Exploit 1

Advisory 7

Other 25

  • TI-2020-13267 Apache Flink directory traversal attack: remote file writing through the REST API CVSS 3.1HIGH 7.5
  • TI-2026-27347 Apache Flink: Remote code execution via SQL injection in code generation CVSS 3.1HIGH 8.1
  • TI-2020-01884 Injection in Apache Flink CVSS 3.1MEDIUM 4.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences