CVE-2021-34427

CRITICAL EXPLOITED NUCLEI

Eclipse BIRT < 4.8.0 - Remote Code Execution via JSP File Upload

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2021-34427 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 1 public exploit from researchers including rt1252. A Nuclei detection template is also available.

AI-analyzed exploit summary This repository contains a functional Python exploit for CVE-2021-34427, a remote code execution vulnerability in Eclipse BIRT. The exploit bypasses file extension checks by appending '/.' to the __document parameter, allowing a JSP webshell to be uploaded and executed.

Description

In Eclipse BIRT versions 4.8.0 and earlier, an attacker can use query parameters to create a JSP file which is accessible from remote (current BIRT viewer dir) to inject JSP code into the running instance.

Exploits (1)

nomisec WORKING POC
by rt1252 · remote
https://github.com/rt1252/CVE-2021-34427

This repository contains a functional Python exploit for CVE-2021-34427, a remote code execution vulnerability in Eclipse BIRT. The exploit bypasses file extension checks by appending '/.' to the __document parameter, allowing a JSP webshell to be uploaded and executed.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Eclipse BIRT 4.8.0
No auth needed
Prerequisites: Target running Eclipse BIRT with exposed /reports endpoint
devstral-2 · analyzed Jun 18, 2026 Full analysis →

Nuclei Templates (1)

Eclipse BIRT Viewer - Remote Code Execution
CRITICALVERIFIEDby us3r777,Synacktiv
Shodan: http.title:"eclipse birt home"

References (3)

Core 3
Core References
Exploit, Mailing List, Third Party Advisory mailing-list
http://seclists.org/fulldisclosure/2022/Dec/30
Exploit, Issue Tracking, Patch, Vendor Advisory
https://bugs.eclipse.org/bugs/show_bug.cgi?id=538142

Scores

CVSS v3 9.8
EPSS 0.5771
EPSS Percentile 99.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

VulnCheck KEV 2025-12-16
CWE
CWE-20 CWE-434
Status published
Products (1)
eclipse/business_intelligence_and_reporting_tools < 4.8.0
Published Jun 25, 2021
Tracked Since Feb 18, 2026