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Security advisories

Browser Zero-Day Vulnerability

March 9, 2021 | 1 MIN READ

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THE THREAT

In the March Microsoft Patch Tuesday release, Microsoft disclosed an actively exploited zero-day vulnerability impacting the Edge (EdgeHTML-based) and Internet Explorer (versions 9 & 11) web-browsers. The vulnerability is tracked as CVE-2021-26411 and received a criticality score of 8.8/10. If exploited, the vulnerability allows for Remote Code Execution (RCE).

Organizations are strongly recommended to apply the security patches provided by Microsoft, as attacks have been identified in the wild.

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Additional information

Details of real-world attacks involving CVE-2021-26411 have not been shared. It is currently unclear how widespread exploitation is of the vulnerability.

In an attack scenario, a threat actor could either host their own malicious page or compromise another website. Users visiting the malicious page from a vulnerable browser will result in the compromise. The only required user interaction is viewing the malicious page, making this an ideal vulnerability for drive-by exploit attacks.

Vulnerable Products:

References:

[1] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-26411

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