How severe is GHSA-395w-qhqr-9fr6?

GHSA-395w-qhqr-9fr6 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-395w-qhqr-9fr6?

GHSA-395w-qhqr-9fr6 affects the following packages: org.apache.flink:flink-runtime_2.11 (Maven), org.apache.flink:flink-runtime_2.12 (Maven). Ecosystems affected: Maven.

How do I fix GHSA-395w-qhqr-9fr6?

Update org.apache.flink:flink-runtime_2.11 to version 1.11.3 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is GHSA-395w-qhqr-9fr6 actively exploited in the wild?

Yes. There are 15 known exploit references for GHSA-395w-qhqr-9fr6, including 1 documented proof-of-concept exploit on Exploit-DB and 10 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for GHSA-395w-qhqr-9fr6?

GHSA-395w-qhqr-9fr6 has an EPSS (Exploit Prediction Scoring System) score of 94.3%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is GHSA-395w-qhqr-9fr6 in the CISA Known Exploited Vulnerabilities catalog?

Yes. GHSA-395w-qhqr-9fr6 (Apache Flink Improper Access Control Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2024-05-23. CISA required all US federal civilian agencies to remediate this vulnerability by 2024-06-13. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is GHSA-395w-qhqr-9fr6?

GHSA-395w-qhqr-9fr6 is classified as CWE-552 (CWE-552). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Is there exploit tooling available for GHSA-395w-qhqr-9fr6?

A Nuclei detection template exists for GHSA-395w-qhqr-9fr6, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was GHSA-395w-qhqr-9fr6 published, and has it been updated?

GHSA-395w-qhqr-9fr6 was published on January 6, 2021 and was last updated on October 22, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2024-05-23 — agencies required to remediate by 2024-06-13

☕ Maven

GHSA-395w-qhqr-9fr6

HIGH

Path Traversal in Apache Flink

Also known asBIT-flink-2020-17519CVE-2020-17519

Published

Jan 6, 2021

Updated

Oct 22, 2025

Affected

2 pkgs

Patched

2 / 2

Exploits

15 known

EPSS Exploitation Probability

via FIRST.org ↗

94.3%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

2 pkgs affected

☕org.apache.flink:flink-runtime_2.11☕org.apache.flink:flink-runtime_2.12

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕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

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-49398webappsjava✓ Verified

Apache Flink 1.11.0 - Unauthenticated Arbitrary File Read (Metasploit)

by SunCSR Team · Jan 8, 2021

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is GHSA-395w-qhqr-9fr6 in your stack?

O3 detects GHSA-395w-qhqr-9fr6 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

7.5/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

None

A:Availability

None

Raw vector

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

CWE Classification

Weaponization

OpenSSF Scorecard

Package health score

flink

6.1/10

Code-Review9/10

Maintained10/10

Branch-ProtectionN/A

Assessed Jun 8, 2026

Timeline

Disclosed

Jan 6, 2021

First exploit

Jan 8, 2021

1 day after disclosure — rapid exploitation

KEV added

May 23, 2024

Last updated

Oct 22, 2025

Identifiers

GHSA-395w-qhqr-9fr6

BIT-flink-2020-17519

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.