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TI-2020-13267 Aliases CVE-2020-17518GHSA-7q5g-gph2-4rc6

Apache Flink directory traversal attack: remote file writing through the REST API

Priority MEDIUM 64CWE-23Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

EPSS 0.49104 98th percentileScored 2026-11-07
Fix Fixed org.apache.flink:flink-runtime (Maven): 1.11.3Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache FlinkApache Flink 1.5.1 to 1.11.2—No fix listedCNA
—org.apache.flink:flink-runtime (Maven)1.5.1 to before 1.11.31.11.3Patch availableGHSA-7q5g-gph2-4rc6
  • Apache Flink VendorApache Affected Apache Flink 1.5.1 to 1.11.2 Fixed in — No fix listed CNA
  • org.apache.flink:flink-runtime (Maven) Vendor— Affected 1.5.1 to before 1.11.3 Fixed in 1.11.3 Patch available GHSA-7q5g-gph2-4rc6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:flink:*:*:*:*:*:*:*:*1.5.1 to before 1.11.3VulnerableApache
  • cpe:2.3:a:apache:flink:*:*:*:*:*:*:*:* Versions 1.5.1 to before 1.11.3 Vulnerable ·Apache

Remediation

  • Fix · GHSA-7q5g-gph2-4rc6 org.apache.flink:flink-runtime (Maven) Fixed in 1.11.3 Advisory →

Red Hat 3 advisories

  • RHSA-2021:3207 Released 2021-08-18 · Red Hat rating Moderate
    Red Hat Integration Camel Quarkus Tech-Preview 2 security update
    • Red Hat Integration Camel Quarkus 2
  • RHSA-2021:3205 Released 2021-08-18 · Red Hat rating Moderate
    Red Hat Integration Camel-K 1.4 release and security update
    • Red Hat Integration
  • RHSA-2021:3140 Released 2021-08-11 · Red Hat rating Moderate
    Red Hat Fuse 7.9.0 release and security update
    • Red Hat Fuse 7.9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Fuse 7.9Fixed RHSA-2021:3140
Red Hat IntegrationFixed RHSA-2021:3205
Red Hat Integration Camel Quarkus 2Fixed RHSA-2021:3207
Not affected: 2 products
  • Red Hat Integration Camel K 1
  • Red Hat Integration Camel Quarkus 1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-17518
  2. 2026-10-03 Alias added: GHSA-7q5g-gph2-4rc6

References

Advisory 3

Other 46

  • TI-2020-13268 Apache Flink directory traversal attack: reading remote files through the REST API KEVCVSS 3.1CRITICAL 9.1
  • 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