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
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.
- Published
- Mar 15, 2013
- Updated
- Jun 16, 2026
- EPSS
- 84.4% · 100th percentile
- CWE
- CWE-326
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Report tools
Action score
48
Plan
Add it to your regular patch cycle.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 25 / 30 · 84.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| oracle | communications application session controller | cpe:2.3:a:oracle:communications_application_session_controller |
| oracle | http server | cpe:2.3:a:oracle:http_server |
| oracle | integrated lights out manager firmware | cpe:2.3:o:oracle:integrated_lights_out_manager_firmware |
| fujitsu | sparc enterprise m3000 firmware | cpe:2.3:o:fujitsu:sparc_enterprise_m3000_firmware |
| fujitsu | sparc enterprise m3000 | cpe:2.3:h:fujitsu:sparc_enterprise_m3000 |
| fujitsu | sparc enterprise m4000 firmware | cpe:2.3:o:fujitsu:sparc_enterprise_m4000_firmware |
| fujitsu | sparc enterprise m4000 | cpe:2.3:h:fujitsu:sparc_enterprise_m4000 |
| fujitsu | sparc enterprise m5000 firmware | cpe:2.3:o:fujitsu:sparc_enterprise_m5000_firmware |
| fujitsu | sparc enterprise m5000 | cpe:2.3:h:fujitsu:sparc_enterprise_m5000 |
| fujitsu | sparc enterprise m8000 firmware | cpe:2.3:o:fujitsu:sparc_enterprise_m8000_firmware |
| fujitsu | sparc enterprise m8000 | cpe:2.3:h:fujitsu:sparc_enterprise_m8000 |
| fujitsu | sparc enterprise m9000 firmware | cpe:2.3:o:fujitsu:sparc_enterprise_m9000_firmware |
and 12 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux12.04
- canonical ubuntu linux12.10
- canonical ubuntu linux13.04
- canonical ubuntu linux13.10
- fujitsu m10-1 firmwarexcp and later · before xcp2280
- fujitsu m10-4 firmwarexcp and later · before xcp2280
- fujitsu m10-4s firmwarexcp and later · before xcp2280
- fujitsu sparc enterprise m3000 firmwarexcp and later · before xcp_1121
- fujitsu sparc enterprise m4000 firmwarexcp and later · before xcp_1121
- fujitsu sparc enterprise m5000 firmwarexcp and later · before xcp_1121
- fujitsu sparc enterprise m8000 firmwarexcp and later · before xcp_1121
- fujitsu sparc enterprise m9000 firmwarexcp and later · before xcp_1121
- mozilla firefox24.1.0 and later · before 24.1.1
- mozilla firefoxbefore 25.0.1
- mozilla firefoxbefore 17.0.11
- mozilla seamonkeybefore 2.22.1
- mozilla thunderbirdbefore 24.1.1
- mozilla thunderbird esrbefore 17.0.11
- oracle communications application session controller3.0.0 and later · up to 3.9.1 inclusive
- oracle http server11.1.1.7.0
Same product
oracle: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-2808The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initializatio36Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Metasploit module | auxiliary/scanner/ssl/ssl_versionSSL/TLS Version Detectionauxiliary | 2014-10-14 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- Metasploit+577 d
- TodayOct 8, 2026+4954 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0412 · Jun 10, 2022(Mitsubishi Electric Bildirimi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-326 · Inadequate Encryption StrengthCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.html
- cr.yp.to/talks/2013.03.12/slides.pdf
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
- marc.info/?l=bugtraq&m=143039468003789&w=2
- my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4
- security.gentoo.org/glsa/glsa-201406-19.xml
- www.isg.rhul.ac.uk/tls/
- www.mozilla.org/security/announce/2013/mfsa2013-103.html
- www.opera.com/docs/changelogs/unified/1215/
- www.opera.com/security/advisory/1046
- www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
- www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- www.securityfocus.com/bid/58796
- www.ubuntu.com/usn/USN-2031-1
- www.ubuntu.com/usn/USN-2032-1
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05289935
- h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05336888
Vendor advisories and official records. Exploit/PoC links are deliberately left out.