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ExploitedIn CISA KEVFix available

CVE-2020-17519

Exploitation confirmed. First attested on 2023-10-14 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2021-01-05
  • Fixed in1.11.3
  • WeaknessCWE-552

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-01-0512:15CVE publishedNVD
  2. 2021-01-08Exploit-DB entryExploit-DB
  3. 2023-10-1414:56Listed as exploited by GCVEGCVE
  4. 2023-10-1414:56Exploitation first reportedGCVE
  5. 2024-05-23Added to the CISA KEV catalogCISA KEV
  6. 2024-05-2413:06SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-17519?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-17519?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV · CISA-ADP
Apache flink
BranchAffectedFixed in
1.11≥ 1.11.0, < 1.11.31.11.3
1.11≥ 1.11.0, ≤ 1.11.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As apache, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Apache Software Foundation Apache Flink
    Affected
    • = Apache Flink 1.11.0 to 1.11.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2024-06-04

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2020-17519 Red Hat Product Security

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

Full record on NVD

Fix

  1. Update Apache flink to 1.11.3
  2. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2024-06-13

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-49398
Exploit-DB
Proof-of-concept repositories
14 repositories, unverifiedB1anda0/CVE-2020-17519QmF0c3UK/CVE-2020-17519dolevf/apache-flink-directory-traversal.nsedev-team-12x/CVE-2020-17519murataydemir/CVE-2020-17519
PoC-in-GitHub
Metasploit modules
1 moduleauxiliary/scanner/http/apache_flink_jobmanager_traversalrank: normalModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-05-23
Patch Due Date
2024-06-13
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2021-01-05
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-395w-qhqr-9fr6

Frequently asked questions

What is CVE-2020-17519?

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.

Is CVE-2020-17519 actively exploited?

Yes. CVE-2020-17519 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-06-13.

What is the CVSS score for CVE-2020-17519?

CVE-2020-17519 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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