CVE-2021-34436

9.8 criticalEPSS 2.2%

Critical (9.8) in eclipse theia. EPSS 2.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 2.2% chance of exploitation in the next 30 days; higher than 82% of CVEs (scores of 2026-10-31)
CWEs: CWE-22, CWE-611
Published: 2021-09-02
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

eclipse:theia

References

https://bugs.eclipse.org/bugs/show_bug.cgi?id=563174
https://bugs.eclipse.org/bugs/show_bug.cgi?id=563174

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