# What is CVE-2011-3389? > CVE-2011-3389 is a medium-severity flaw (CVSS 4.3) in Chrome from Google, published on 6 September 2011. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 73%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2011-3389 ## At a glance - **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. - **Precursor Intelligence risk score:** 46 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 4.3 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 73% (latest exploit-likelihood forecast) - **Published:** 6 September 2011 - **Record last updated:** 11 April 2025 - **Main product:** Chrome from Google - **Affected products:** 17 ## What is CVE-2011-3389? In plain terms It can be attacked from anywhere on the internet without logging in. If it works, the attacker can read some data. ### The official 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. ### What kind of flaw is it? - CWE-326: Inadequate Encryption Strength ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Some conditions needed - Login needed first: No login needed - What an attacker gets: Can read some data Severity vector: `AV:N/AC:M/Au:N/C:P/I:N/A:N` ## Is CVE-2011-3389 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 73%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 73%, 73%, 73%, 73%, 73%, 73%, 73%. ### Timeline - 6 September 2011: Published - 11 April 2025: Record last updated - 16 June 2026: Exploit likelihood jumped ### How Precursor Intelligence ranks it CVE-2011-3389 scores **46 out of 100 (Medium)**, with the action "Plan remediation". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: smaller factor - Threat activity around it: smaller factor 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2011-3389? The published record lists 17 products. Versions are as published: "before 3.2.1" means every version up to, but not including, 3.2.1. - [Chrome](https://www.precursorintelligence.com/product/google/chrome) by [Google](https://www.precursorintelligence.com/vendors/google) (Application): version not specified - [Ubuntu Linux](https://www.precursorintelligence.com/product/canonical/ubuntu_linux) by [Canonical](https://www.precursorintelligence.com/vendors/canonical) (Operating system): 10.04, 10.10, 11.04, 11.10 - [Debian Linux](https://www.precursorintelligence.com/product/debian/debian_linux) by [Debian](https://www.precursorintelligence.com/vendors/debian) (Operating system): 5.0, 6.0 - [Enterprise Linux Desktop](https://www.precursorintelligence.com/product/redhat/enterprise_linux_desktop) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 5.0, 6.0 - [Enterprise Linux Server](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 5.0, 6.0 - [Enterprise Linux Workstation](https://www.precursorintelligence.com/product/redhat/enterprise_linux_workstation) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 5.0, 6.0 - [Curl](https://www.precursorintelligence.com/product/haxx/curl) by [Haxx](https://www.precursorintelligence.com/vendors/haxx) (Application): 7.10.6 to 7.23.1 - [Enterprise Linux Eus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_eus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.2 - [Enterprise Linux Server Aus](https://www.precursorintelligence.com/product/redhat/enterprise_linux_server_aus) by [Red Hat](https://www.precursorintelligence.com/vendors/redhat) (Operating system): 6.2 - [Firefox](https://www.precursorintelligence.com/product/mozilla/firefox) by [Mozilla](https://www.precursorintelligence.com/vendors/mozilla) (Application): version not specified - [Internet Explorer](https://www.precursorintelligence.com/product/microsoft/internet_explorer) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Application): version not specified - [Opera Browser](https://www.precursorintelligence.com/product/opera/opera_browser) by [Opera](https://www.precursorintelligence.com/vendors/opera) (Application): version not specified - [Simatic Rf615r](https://www.precursorintelligence.com/product/siemens/simatic_rf615r) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic Rf615r Firmware](https://www.precursorintelligence.com/product/siemens/simatic_rf615r_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 3.2.1 - [Simatic Rf68xr](https://www.precursorintelligence.com/product/siemens/simatic_rf68xr) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Hardware): version not specified - [Simatic Rf68xr Firmware](https://www.precursorintelligence.com/product/siemens/simatic_rf68xr_firmware) by [Siemens](https://www.precursorintelligence.com/vendors/siemens) (Operating system): before 3.2.1 - [Windows](https://www.precursorintelligence.com/product/microsoft/windows) by [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) (Operating system): version not specified ## How do I fix CVE-2011-3389? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [googlechromereleases.blogspot.com](http://googlechromereleases.blogspot.com/2011/10/chrome-stable-release.html) (Not applicable, Vendor advisory) - [blog.mozilla.com](http://blog.mozilla.com/security/2011/09/27/attack-against-tls-protected-communications/) (Third-party advisory) - [blogs.technet.com](http://blogs.technet.com/b/msrc/archive/2011/09/26/microsoft-releases-security-advisory-2588513.aspx) (Third-party advisory) - [blogs.technet.com](http://blogs.technet.com/b/srd/archive/2011/09/26/is-ssl-broken-more-about-security-advisory-2588513.aspx) (Third-party advisory) - [curl.haxx.se](http://curl.haxx.se/docs/adv_20120124B.html) (Third-party advisory) - [downloads.asterisk.org](http://downloads.asterisk.org/pub/security/AST-2016-001.html) (Third-party advisory) - [ekoparty.org](http://ekoparty.org/2011/juliano-rizzo.php) (Broken link) - [eprint.iacr.org](http://eprint.iacr.org/2004/111) (Third-party advisory) - [eprint.iacr.org](http://eprint.iacr.org/2006/136) (Third-party advisory) - [isc.sans.edu](http://isc.sans.edu/diary/SSL+TLS+part+3+/11635) (Third-party advisory) - [lists.apple.com](http://lists.apple.com/archives/Security-announce/2011//Oct/msg00001.html) (Broken link) - [lists.apple.com](http://lists.apple.com/archives/Security-announce/2011//Oct/msg00002.html) (Broken link) - [lists.apple.com](http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html) (Broken link, Mailing list) - [lists.apple.com](http://lists.apple.com/archives/security-announce/2012/Jul/msg00001.html) (Broken link, Mailing list) - [lists.apple.com](http://lists.apple.com/archives/security-announce/2012/May/msg00001.html) (Broken link, Mailing list) - [lists.apple.com](http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html) (Broken link, Mailing list) - [lists.apple.com](http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html) (Broken link, Mailing list) - [lists.opensuse.org](http://lists.opensuse.org/opensuse-security-announce/2012-01/msg00049.html) (Broken link) - [lists.opensuse.org](http://lists.opensuse.org/opensuse-security-announce/2012-01/msg00051.html) (Broken link) - [lists.opensuse.org](http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00009.html) (Broken link) - [lists.opensuse.org](http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html) (Broken link) - [marc.info](http://marc.info/?l=bugtraq&m=132750579901589&w=2) (Issue tracking, Mailing list, Third-party advisory) - [marc.info](http://marc.info/?l=bugtraq&m=132872385320240&w=2) (Issue tracking, Mailing list, Third-party advisory) - [marc.info](http://marc.info/?l=bugtraq&m=133365109612558&w=2) (Issue tracking, Mailing list, Third-party advisory) - [marc.info](http://marc.info/?l=bugtraq&m=133728004526190&w=2) (Issue tracking, Mailing list, Third-party advisory) - [marc.info](http://marc.info/?l=bugtraq&m=134254866602253&w=2) (Issue tracking, Mailing list, Third-party advisory) - [marc.info](http://marc.info/?l=bugtraq&m=134254957702612&w=2) (Issue tracking, Mailing list, Third-party advisory) - [my.opera.com](http://my.opera.com/securitygroup/blog/2011/09/28/the-beast-ssl-tls-issue) (Third-party advisory) - [osvdb.org](http://osvdb.org/74829) (Broken link) - [rhn.redhat.com](http://rhn.redhat.com/errata/RHSA-2012-0508.html) (Third-party advisory) - [rhn.redhat.com](http://rhn.redhat.com/errata/RHSA-2013-1455.html) (Broken link) - [secunia.com](http://secunia.com/advisories/45791) (Not applicable) - [secunia.com](http://secunia.com/advisories/47998) (Not applicable) - [secunia.com](http://secunia.com/advisories/48256) (Not applicable) - [secunia.com](http://secunia.com/advisories/48692) (Not applicable) - [secunia.com](http://secunia.com/advisories/48915) (Not applicable) - [secunia.com](http://secunia.com/advisories/48948) (Not applicable) - [secunia.com](http://secunia.com/advisories/49198) (Not applicable) - [secunia.com](http://secunia.com/advisories/55322) (Not applicable) - [secunia.com](http://secunia.com/advisories/55350) (Not applicable) - [secunia.com](http://secunia.com/advisories/55351) (Not applicable) - [security.gentoo.org](http://security.gentoo.org/glsa/glsa-201203-02.xml) (Third-party advisory) - [security.gentoo.org](http://security.gentoo.org/glsa/glsa-201406-32.xml) (Third-party advisory) - [support.apple.com](http://support.apple.com/kb/HT4999) (Third-party advisory) - [support.apple.com](http://support.apple.com/kb/HT5001) (Third-party advisory) ## Questions ### What is CVE-2011-3389? CVE-2011-3389 is a medium-severity flaw in Chrome from Google, published on 6 September 2011. It can be attacked from anywhere on the internet without logging in. If it works, the attacker can read some data. ### How serious is CVE-2011-3389? It scores 4.3 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2011-3389 is 46 out of 100, which is Medium. Its action is "Plan remediation". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. ### Is CVE-2011-3389 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 73%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2011-3389 affect? For Chrome from Google: version not specified. The record lists 17 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2011-3389? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2011-3389 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact