CVE-2021-34435
8.8 · HIGHOverview
CVE-2021-34435 is a high-severity vulnerability affecting eclipse theia. It was published on September 1, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
In Eclipse Theia 0.3.9 to 1.8.1, the "mini-browser" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file..
Remediation
Check the references section for vendor advisories and patches from eclipse. Update theia to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| eclipse | theia | 0.3.9 | Affected |
Frequently Asked Questions
What is CVE-2021-34435?
CVE-2021-34435 is a high-severity vulnerability affecting eclipse theia. It was published on September 1, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2021-34435?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-34435?
Check the references section for vendor advisories and patches from eclipse. Update theia to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-34435?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-34435 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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