Apache Flink - Arbitrary File Read (CVE-2020-17519)
286Exploiting IPs reported
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.
CrowdSec analysis
CVE-2020-17519 is a vulnerability in Apache Flink that permits attackers to perform directory traversal via the JobManager REST interface, enabling unauthorized access to files on the local filesystem.
CrowdSec has been tracking this vulnerability and its exploits since 10th of March 2025.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2020-17519 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2020-17519. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.
Observed attacks commonly attempt to access URLs containing /jobmanager/logs/...
Exploitation
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Common Weakness Enumeration (CWE)
Protection
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Blocklist
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