HOME VULNERABILITIESCVE-2013-2566

MEDIUM

CVE-2013-2566

CWE-326Published: March 15, 2013· Updated: Jun 16, 2026

5.9

CVSS v3.1

Official Description

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.

Technical Analysis

CVE-2013-2566 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

fujitsu16 product(s)

sparc enterprise m3000 firmwaresparc enterprise m3000sparc enterprise m4000 firmwaresparc enterprise m4000sparc enterprise m5000 firmwaresparc enterprise m5000sparc enterprise m8000 firmwaresparc enterprise m8000sparc enterprise m9000 firmwaresparc enterprise m9000m10-1 firmwarem10-1+4

Mozilla4 product(s)

firefoxseamonkeythunderbirdthunderbird esr

Oracle3 product(s)

communications application session controllerhttp serverintegrated lights out manager firmware

Source: NVD CPE · 31 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.html

ADVISORYhttp://cr.yp.to/talks/2013.03.12/slides.pdf

ADVISORYhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705

ADVISORYhttp://marc.info/?l=bugtraq&m=143039468003789&w=2

ADVISORYhttp://my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4

ADVISORYhttp://security.gentoo.org/glsa/glsa-201406-19.xml

ADVISORYhttp://www.isg.rhul.ac.uk/tls/

ADVISORYhttp://www.mozilla.org/security/announce/2013/mfsa2013-103.html

ADVISORYhttp://www.opera.com/docs/changelogs/unified/1215/

ADVISORYhttp://www.opera.com/security/advisory/1046

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

ADVISORYhttp://www.securityfocus.com/bid/58796

ADVISORYhttp://www.ubuntu.com/usn/USN-2031-1

ADVISORYhttp://www.ubuntu.com/usn/USN-2032-1

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05289935

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05336888

ADVISORYhttps://security.gentoo.org/glsa/201504-01

ADVISORYhttp://blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.html

ADVISORYhttp://cr.yp.to/talks/2013.03.12/slides.pdf

ADVISORYhttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705

ADVISORYhttp://marc.info/?l=bugtraq&m=143039468003789&w=2

ADVISORYhttp://my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4

ADVISORYhttp://security.gentoo.org/glsa/glsa-201406-19.xml

ADVISORYhttp://www.isg.rhul.ac.uk/tls/

ADVISORYhttp://www.mozilla.org/security/announce/2013/mfsa2013-103.html

ADVISORYhttp://www.opera.com/docs/changelogs/unified/1215/

ADVISORYhttp://www.opera.com/security/advisory/1046

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

ADVISORYhttp://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

ADVISORYhttp://www.securityfocus.com/bid/58796

ADVISORYhttp://www.ubuntu.com/usn/USN-2031-1

ADVISORYhttp://www.ubuntu.com/usn/USN-2032-1

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05289935

ADVISORYhttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05336888

ADVISORYhttps://security.gentoo.org/glsa/201504-01

All References (42)

→

http://blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.htmlThird Party Advisory

→

http://cr.yp.to/talks/2013.03.12/slides.pdfThird Party Advisory

→

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705Third Party Advisory

→

http://marc.info/?l=bugtraq&m=143039468003789&w=2Issue Tracking · Third Party Advisory

→

http://my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4Third Party Advisory

→

http://security.gentoo.org/glsa/glsa-201406-19.xmlThird Party Advisory

→

http://www.isg.rhul.ac.uk/tls/Third Party Advisory

→

http://www.mozilla.org/security/announce/2013/mfsa2013-103.htmlThird Party Advisory

→

http://www.opera.com/docs/changelogs/unified/1215/Third Party Advisory

→

http://www.opera.com/security/advisory/1046Third Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.htmlThird Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlThird Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.htmlThird Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlThird Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2013-2566

CVSS Score5.9 / 10

SeverityMEDIUM

WeaknessCWE-326

CISA KEVNo

Affected4 vendor(s)

PublishedMar 15, 2013

Related CVEs (CWE-326)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2013-2566 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

← All Vulnerabilities·Search for CVE-2013-2566·NVD