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CVE-2020-17519

Apache Flink Improper Access Control

7.5 HIGHActively exploited (CISA KEV)Public exploitEPSS 97.8%
  1. Published5 Jan 2021
  2. Added to CISA KEV23 May 2024
  3. Remediation due13 Jun 2024
Actively exploited (CISA KEV)

Apache Flink contains an improper access control vulnerability that allows an attacker to read any file on the local filesystem of the JobManager through its REST interface.

Added to KEV: 23 May 2024Federal remediation due: 13 Jun 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Apache Flink≥ 1.11.0 < 1.11.3

Remediation

Fixed in
Apache Flink≥ 1.11.3

References

and 7 more references

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Frequently asked

Is CVE-2020-17519 being actively exploited?

Yes. CVE-2020-17519 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 23 May 2024.

How severe is CVE-2020-17519?

CVE-2020-17519 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 97.8% probability of exploitation.

Which products are affected by CVE-2020-17519?

Affected products include Apache Flink.

How do I fix CVE-2020-17519?

Upgrade affected software to a fixed version, for example Apache Flink 1.11.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-17519 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.