Vulnerability DatabaseCVE-2013-2566
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CVE-2013-2566
Published:March 14, 2013
Updated:May 22, 2026
The RC4 algorithm, as used in the TLS protocol and SSL protocol, has many single-byte biases, which makes it easier for remote attackers to conduct plaintext-recovery attacks via statistical analysis of ciphertext in a large number of sessions that use the same plaintext.
Related Resources (23)
https://access.redhat.com/security/cve/CVE-2013-2566
http://www.isg.rhul.ac.uk/tls/
http://marc.info/?l=bugtraq&m=143039468003789&w=2
https://people.canonical.com/~ubuntu-security/cve/CVE-2013-2566
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05289935
http://www.opera.com/docs/changelogs/unified/1215/
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
https://security.gentoo.org/glsa/201504-01
http://cr.yp.to/talks/2013.03.12/slides.pdf
http://security.gentoo.org/glsa/glsa-201406-19.xml
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.ubuntu.com/usn/USN-2032-1
http://my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.mozilla.org/security/announce/2013/mfsa2013-103.html
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05336888
http://www.ubuntu.com/usn/USN-2031-1
http://www.opera.com/security/advisory/1046
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
http://blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.securityfocus.com/bid/58796
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CVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
POC
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Exploit Maturity
FUNCTIONAL
Weakness Type (CWE)
Inadequate Encryption Strength
CWE-326
EPSS
Base Score:
90.76