CVE-2011-3389

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

73.3% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2011-09-06 19:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-09 20:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 73.3% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2011-09-06 19:55 UTC

Last modified

2026-10-09 20:17 UTC

Exploit probability

73.3% · EPSS, next 30 days

Weakness

CWE-326 · Inadequate encryption strength

Record status

Modified

Affected

• Google Chrome
• Microsoft Internet Explorer
• Mozilla Firefox
• Opera Browser
• Microsoft Windows
• Siemens Simatic rf68xr Firmware < 3.2.1
• Siemens Simatic rf615r Firmware < 3.2.1
• Haxx Curl ≤ 7.23.1

Attack profile CVSS 2.0 · 4.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-3389.md and follow it. Check whether this project is affected by CVE-2011-3389. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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