CVE-2011-3389
MediumThe 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…
Published Sep 6, 2011 · Updated Oct 9, 2026 · Also known as CURL-CVE-2011-3389, DEBIAN-CVE-2011-3389, DEBIAN-CVE-2011-3521, DEBIAN-CVE-2011-3544, DEBIAN-CVE-2011-3547, DEBIAN-CVE-2011-3548, DEBIAN-CVE-2011-3551, DEBIAN-CVE-2011-3552, DEBIAN-CVE-2011-3553, DEBIAN-CVE-2011-3554, DEBIAN-CVE-2011-3556, DEBIAN-CVE-2011-3557, DEBIAN-CVE-2011-3560, DLA-154-1, DSA-2356-1, DSA-2368-1, DSA-2398-1, PSF-2011-3, SUSE-SU-2020:0114-1
Key Facts
Patch immediately- CVE-2011-3389 is a medium-severity vulnerability (CVSS 4.3 v2) affecting Chrome (Google), Curl (Haxx), Internet Explorer (Microsoft) and 22 more products.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 73% probability of exploitation in the next 30 days.
- Fixed versions are available, including asterisk 1:13.7.2~dfsg-1, bouncycastle 1.49+dfsg-1, Curl 7.18.2-8lenny6.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
4.3
AV:N/AC:M/Au:N/C:P/I:N/A:N
EPSS (30-day exploit likelihood)
73%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2011-3389 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Affected Products
309 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ChromeGoogle | See advisory | n/a |
| CurlHaxx | See advisory | 7.23.1 |
| Internet ExplorerMicrosoft | See advisory | n/a |
| FirefoxMozilla | See advisory | n/a |
| Opera BrowserOpera | See advisory | n/a |
Patched Releases
asterisk
1:13.7.2~dfsg-1
bouncycastle
1.49+dfsg-1
Curl
7.18.2-8lenny6, 7.21.0-2.1+squeeze1, 7.24.0-1, 7.23.1
erlang
1:15.b-dfsg-1
fetchmail
6.3.26-13.4
fetchmailconf
6.3.26-13.4
gnutls28
3.7.1-5+deb11u7+sp999, 3.8.9-3+e1
java
1.4.2-ibm-0:1.4.2.13.11-1jpp.1.el4, 1.4.2-ibm-0:1.4.2.13.11-1jpp.1.el5, 1.6.0-openjdk-1:1.6.0.0-1.40.1.9.10.el6_1
java-1.6.0-openjdk
1:1.6.0.0-1.23.1.9.10.0.1.el5_7, 1:1.6.0.0-1.40.1.9.10.el6_1, 1:1.6.0.0-52.1.9.10.40.amzn1
java-1.6.0-openjdk-demo
1:1.6.0.0-1.23.1.9.10.0.1.el5_7, 1:1.6.0.0-1.40.1.9.10.el6_1, 1:1.6.0.0-52.1.9.10.40.amzn1
java-1.6.0-openjdk-devel
1:1.6.0.0-1.23.1.9.10.0.1.el5_7, 1:1.6.0.0-1.40.1.9.10.el6_1, 1:1.6.0.0-52.1.9.10.40.amzn1
java-1.6.0-openjdk-javadoc
1:1.6.0.0-1.23.1.9.10.0.1.el5_7, 1:1.6.0.0-1.40.1.9.10.el6_1, 1:1.6.0.0-52.1.9.10.40.amzn1
java-1.6.0-openjdk-src
1:1.6.0.0-1.23.1.9.10.0.1.el5_7, 1:1.6.0.0-1.40.1.9.10.el6_1, 1:1.6.0.0-52.1.9.10.40.amzn1
libfreebl3
3.26.2-1.1
libfreebl3-32bit
3.26.2-1.1
libpython2_7-1_0
2.7.12-1.4, 2.7.17-7.32.1
libpython2_7-1_0-32bit
2.7.12-1.4
libpython3_5m1_0
3.5.1-3.6
libpython3_5m1_0-32bit
3.5.1-3.6
libpython3_6m1_0
3.6.10-3.42.2, 3.6.10-lp151.6.7.1
libpython3_6m1_0-32bit
3.6.10-lp151.6.7.1
libsoftokn3
3.26.2-1.1
libsoftokn3-32bit
3.26.2-1.1
lighttpd
1.4.19-5+lenny3, 1.4.28-2+squeeze1, 1.4.30-1
nss
3.26.2-1.1, 3.12.8-1+squeeze11, 3.13.1.with.ckbi.1.88-1, 3.53.1-3.el7_9+sp999
Timeline
Publicly disclosed
Sep 6, 2011
Last updated
Oct 9, 2026
Weakness Type
- CWE-326 Inadequate Encryption Strength
References
- advisoryhttp://blog.mozilla.com/security/2011/09/27/attack-against-tls-protected-communications/
- advisoryhttp://blogs.technet.com/b/msrc/archive/2011/09/26/microsoft-releases-security-advisory-2588513.aspx
- advisoryhttp://blogs.technet.com/b/srd/archive/2011/09/26/is-ssl-broken-more-about-security-advisory-2588513.aspx
- advisoryhttp://curl.haxx.se/docs/adv_20120124B.html
- advisoryhttp://downloads.asterisk.org/pub/security/AST-2016-001.html
FAQ
Common Questions.
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 block…
Affected: Chrome (Google); Curl (Haxx); Internet Explorer (Microsoft), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including asterisk 1:13.7.2~dfsg-1, bouncycastle 1.49+dfsg-1, Curl 7.18.2-8lenny6.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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