CVE-2011-3389

4.3
CVSS v2.0 Base Score
73.33%
HIGH RiskEPSS (99th percentile)

The SSL protocol, as used in certain configurations in Microsoft Windows and Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, Opera, and other products, encrypts data by using CBC mode with chained initialization vectors, which allows man-in-the-middle attackers to obtain plaintext HTTP headers via a blockwise chosen-boundary attack (BCBA) on an HTTPS session, in conjunction with JavaScript code that uses (1) the HTML5 WebSocket API, (2) the Java URLConnection API, or (3) the Silverlight WebClient API, aka a "BEAST" attack.

Published: 9/6/2011
Modified: 6/16/2026
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Vulnerability Summary

CVSS v2 Score

4.3

AV:N/AC:M/Au:N/C:P/I:N/A:N

EPSS Score (Exploitation Probability)

73.33%HIGH Exploitation Risk
99th percentile

This vulnerability has a 73.33% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

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