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CVE-2011-3389: The SSL protocol, as used in certain configurations in Microsoft Windows and Microsoft Internet Explorer, Mozi

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MEDIUM 4.3WATCHLISTMITIGATEMITIGATEMITIGATE

CVE-2011-3389 is a medium-severity flaw (CVSS 4.3) affecting chrome, internet explorer, firefox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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,

Why this priority

  • EPSS top 1%: very likely to be exploited
  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score4.3 (Medium)
EPSS exploit chance73.3% (top 1%)
CISA exploited listNo
WeaknessCWE-326
Published2011-09-06
Last modified2026-10-09
Publisher (CNA): MITRE · Vendor: google · microsoft · mozilla · opera · siemens

Share: LinkedIn · X · Reddit

Last updated 2026-10-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

google chrome MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy chrome || rpm -q chrome || chrome --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft internet explorer MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy internet-explorer || rpm -q internet-explorer || internet-explorer --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
mozilla firefox MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy firefox || rpm -q firefox || firefox --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
opera opera browser MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy opera-browser || rpm -q opera-browser || opera-browser --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft windows MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
siemens simatic rf68xr firmware UPGRADE
Affected: < 3.2.1
Fixed in: 3.2.1
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-3389?

chrome: mitigate or apply the listed mitigation; internet explorer: mitigate or apply the listed mitigation; firefox: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-3389 being exploited?

CVE-2011-3389 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-3389 affect?

CVE-2011-3389 affects chrome, internet explorer, firefox. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2011-3389?

Priority 50/100. EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Windows vulnerabilities · Google Chrome vulnerabilities · Mozilla Firefox vulnerabilities · Internet Explorer vulnerabilities · Siemens vulnerabilities

Related CVEs

References

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