CVE-2021-45456Public exploitNetwork attack vector

Authenticated command execution via project-name validation mismatch

Published Jan 6, 2022 · Updated Aug 4, 2024

Command injection in DiagnosisService in Apache Kylin 4.0.0 allows remote authenticated users to execute arbitrary shell commands. The method validates a stripped project name but passes the original untrusted name to diag.sh, allowing shell syntax to survive validation. An account with project-creation and diagnostic-export access is required; commands run with the Kylin server process's privileges.

CVSS severity9.8
Critical
EPSS probability88.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command injection in DiagnosisService in Apache Kylin 4.0.0 allows remote authenticated users to execute arbitrary shell commands. The method validates a stripped project name but passes the original untrusted name to diag.sh, allowing shell syntax to survive validation. An account with project-creation and diagnostic-export access is required; commands run with the Kylin server process's privileges.

The record

CVE
CVE-2021-45456
Published
Jan 6, 2022
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Kylin
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache Kylin 4 4.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Kylinversion=Apache Kylin 4 4.0.0

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo