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Status published
Critical
CVE-2021-34436
In Eclipse Theia 0.1.1 to 0.2.0, it is possible to...
Vulnerability Description
In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension. This extension uses lsp4xml (recently renamed to LemMinX) in order to provide language support for XML. This is installed by default.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
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Affected Vendor
The Eclipse Foundation
View all reports →Affected Software
Eclipse Theia
Vulnerable Versions:
0.1.1, 0.1.2, 0.2.0-next.28bc2735, 0.2.0-next.41406d98, 0.2.0-next.a2958907
Timeline
Official Publish:
September 2nd, 2021
Last Modified:
August 4th, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
MITRE ATT&CK TTPs
T1190
Exploit Public-Facing Application
Initial Access
T1005
Data from Local System
Collection
T1040
Network Sniffing
Collection
T1105
Ingress Tool Transfer
Command and Control
T1499
Endpoint Denial of Service
Impact
T1552
Unsecured Credentials
Credential Access
T1565.001
Stored Data Manipulation
Impact