CVE-2017-0210: Internet Explorer cross-domain policy bypass elevation of privilege

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 17 September 2026. Confidence: medium.

high priorityIt is in CISA KEV with a high EPSS percentile and a CVSS of 8.8, but exploitation requires user interaction and the affected browser is largely legacy.

What it is

Internet Explorer fails to properly enforce cross-domain policies, allowing an attacker to read information from one domain and inject it into another. This breaks the browser's origin isolation, which is the core boundary protecting web content and sessions from each other.

Impact

An attacker can access data from one domain and inject it into another, enabling cross-origin data theft and content injection that can lead to code execution in the context of the victim's browser session.

Attack surface

Reached over the network via a crafted web page; the CVSS vector shows no privileges required but user interaction is required, so the victim must visit or interact with attacker-controlled content in Internet Explorer.

Exploitation

It is listed in CISA's Known Exploited Vulnerabilities catalog with a due date of 2022-06-14, and EPSS gives a 30-day probability of 0.22334 (97.6th percentile), indicating observed exploitation and elevated likelihood.

What to do

• Apply the Microsoft security update referenced in the vendor advisory (portal.msrc.microsoft.com advisory CVE-2017-0210) as the first action.
• Retire or block Internet Explorer where possible and migrate users to a supported browser.
• Enforce cross-domain and zone restrictions via Group Policy for any remaining IE usage.
• Restrict access to untrusted web content from systems that still run Internet Explorer.

Detection

• Monitor for Internet Explorer process activity loading content from untrusted or unexpected domains.
• Review proxy and web logs for IE user agents reaching known exploit or malvertising hosts.
• Alert on suspicious child processes or script execution originating from iexplore.exe.
• Track unpatched IE installations against the vendor advisory baseline.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.