CVE-2021-21157
8.8 · HIGHOverview
CVE-2021-21157 is a high-severity vulnerability affecting microsoft edge. It was published on February 22, 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
Use after free in Web Sockets in Google Chrome on Linux prior to 88.0.4324.182 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Remediation
Check the references section for vendor advisories and patches from microsoft. Update edge 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 |
|---|---|---|---|
| microsoft | edge | >= 0, < 88.0.705.74 | Affected |
| microsoft | edge_chromium | >= 0, < 88.0.4324.182 | Affected |
| chrome | >= 0, < 88.0.4324.182 | Affected |
References
Frequently Asked Questions
What is CVE-2021-21157?
CVE-2021-21157 is a high-severity vulnerability affecting microsoft edge. It was published on February 22, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2021-21157?
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-2021-21157?
Check the references section for vendor advisories and patches from microsoft. Update edge 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-2021-21157?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-21157 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.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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