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CVE-2013-2566

MEDIUM

5.9

CVSS Score

Published: March 14, 2013 at 10:00 PM UTC

Updated: June 16, 2026 at 11:53 PM UTC

24 products affected across 4 vendorsUbuntu LinuxFirefoxThunderbird

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Severity

MEDIUM5.9

Exploit prediction

EPSS 84%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux · Canonicalrubygems

95%

12.04 12.10 13.04 13.10

M10-1 Firmware · Fujitsu

95%

xcp ≤ v < xcp2280

Affected range stops below xcp2280, so it looks safe — our inference, not a vendor statement

fujitsu-m10-1 (same device)

M10-4 Firmware · Fujitsu

95%

xcp ≤ v < xcp2280

Affected range stops below xcp2280, so it looks safe — our inference, not a vendor statement

fujitsu-m10-4 (same device)

M10-4s Firmware · Fujitsu

95%

xcp ≤ v < xcp2280

Affected range stops below xcp2280, so it looks safe — our inference, not a vendor statement

fujitsu-m10-4s (same device)

Sparc Enterprise M3000 Firmware · Fujitsu

95%

xcp ≤ v < xcp_1121

Affected range stops below xcp_1121, so it looks safe — our inference, not a vendor statement

fujitsu-sparc-enterprise-m3000 (same device)

Sparc Enterprise M4000 Firmware · Fujitsu

95%

xcp ≤ v < xcp_1121

Affected range stops below xcp_1121, so it looks safe — our inference, not a vendor statement

fujitsu-sparc-enterprise-m4000 (same device)

Sparc Enterprise M5000 Firmware · Fujitsu

95%

xcp ≤ v < xcp_1121

Affected range stops below xcp_1121, so it looks safe — our inference, not a vendor statement

fujitsu-sparc-enterprise-m5000 (same device)

Sparc Enterprise M8000 Firmware · Fujitsu

95%

xcp ≤ v < xcp_1121

Affected range stops below xcp_1121, so it looks safe — our inference, not a vendor statement

fujitsu-sparc-enterprise-m8000 (same device)

Sparc Enterprise M9000 Firmware · Fujitsu

95%

xcp ≤ v < xcp_1121

Affected range stops below xcp_1121, so it looks safe — our inference, not a vendor statement

fujitsu-sparc-enterprise-m9000 (same device)

Firefox · Mozilla

95%

v < 17.0.11v < 25.0.124.1.0 ≤ v < 24.1.1

Affected range stops below 17.0.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.1.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (21)

x_refsource_MISCThird Party Advisory

Source: [email protected]

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

x_refsource_MISCThird Party Advisory

Source: [email protected]

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

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

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

Vendor Advisoryx_refsource_HPIssue TrackingThird Party Advisory

Source: [email protected]

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

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

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

Vendor Advisoryx_refsource_GENTOOThird Party Advisory

Source: [email protected]

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

x_refsource_MISCThird Party Advisory

Source: [email protected]

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

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMCISA-ADP

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-326CWE-327

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