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Fencer Vulns
critical 9.1

CVE-2020-17519 kev in the critical feed json

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

published 2021-01-05 5 y ago modified 2026-09-10 59 d ago also BIT-flink-2020-17519 , EUVD-2021-0481 , GHSA-395w-qhqr-9fr6

cvss
9.1
version 3.1, CNA
cisa kev
Exploited
added 2024-05-23
epss
98.0%
EPSS 98.0% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit, Exploit-DB, plus a Nuclei check

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.

Patch / fix

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

  • maven org.apache.flink:flink-runtime_2.11 1.11.3
  • maven org.apache.flink:flink-runtime_2.12 1.11.3
  • bitnami flink 1.11.3
  • apache flink 1.11.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-17519 updated cvss 7.5

apache-flink: directory traversal attack allows reading remote files through the REST API

  • Red Hat Fuse 7 camel-flink Red Hat Integration Camel K 1 camel-flink
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit auxiliary/scanner/http/apache_flink_jobmanager_traversal)
  2. Published
  3. Added to CISA KEV
  4. CISA SSVC: exploitation active
  5. CISA patch deadline

Known exploited

Added
2 y ago
Patch by
2024-06-13 (2 y ago)
Ransomware
Not known
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor, product
Apache, Flink
CISA name
Apache Flink Improper Access Control Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

98.00% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.flink:flink-runtime_2.11
>=1.11.0, <1.11.3
1.11.3
maven org.apache.flink:flink-runtime_2.12
>=1.11.0, <1.11.3
1.11.3
bitnami flink
>=1.11.0, <1.11.3
1.11.3

Affected products

  • Apache Software Foundation Apache Flink
  • apache flink

Classification

Weakness
  • CWE-552 Files or Directories Accessible to External Parties
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.