---
id: "CVE-2020-1956"
kind: "vulnerability"
aliases: ["CVE-2020-1956"]
title: "Apache Kylin: Apache Kylin OS Command Injection Vulnerability"
severity: "critical"
cvss: 9.0
epss: 0.97337
exploited: true
status: "open"
category: "package"
products: [{"name": "Apache Kylin", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apache-kylin", "exploited", "java", "package", "self-hosted"]
not_affected_if: ["not-running-kylin"]
published_at: "2020-05-22T14:15:11+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-1956", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-1956", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-1956", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Apache Kylin: Apache Kylin OS Command Injection Vulnerability

Apache Kylin, an open-source OLAP engine for big data, has an OS command injection flaw that lets remote attackers run commands on the server. CISA lists it as actively exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Apache Kylin affected ? fixed ?

## Fix

Apply the updates per vendor instructions (Apache Kylin security advisory); the affected and fixed versions are not stated in the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-1956
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-1956
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-1956

## From the sources

Apache Kylin 2.3.0, and releases up to 2.6.5 and 3.0.1 has some restful apis which will concatenate os command with the user input string, a user is likely to be able to execute any os command without any protection or validation.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_