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CVE Record

CVE-2020-17519: Apache Flink directory traversal attack: reading remote files through the REST API

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.

CriticalCVSS 9.1Known exploitedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

Apache Flink 1.11.0 through 1.11.2 can let an unauthenticated remote attacker read files from the JobManager host through its REST API. The business risk is exposure of secrets, configuration, credentials, or operational data available to the JobManager process. Exposure is most likely where Apache Flink 1.11.0, 1.11.1, or 1.11.2 has a JobManager REST interface reachable by untrusted networks, users, or workloads. Prioritize remediation urgently for any internet-facing or broadly reachable Flink JobManager. This is KEV-listed, critical severity, and can expose sensitive files without authentication on affected versions. Mitigation focus: Upgrade affected Flink deployments to 1.11.3, 1.12.0, or a later fixed release.; Remove untrusted access to the JobManager REST interface until patched.; Inventory Flink versions in clusters, images, and deployment manifests..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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File access behavior lookup

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CVE-2020-17519 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.1 (3.1)
Known Exploited
Yes
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
16Source links

CISA KEV status

Status
Known exploited
Source
CISA / ADP
Date added
Not provided

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.1CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H3.95.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

9.1Critical
CVSS 3.1 vector shape for CVE-2020-17519Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache FlinkApache Flink 1.11.0 to 1.11.2Listed
Weakness

CWE details

CWE-552

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