{"cve":"CVE-2013-2566","nvd":{"published":"2013-03-15T21:55:01.047","modified":"2026-06-16T23:53:38.837","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-326","CWE-327"],"references":["http://blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.html","http://cr.yp.to/talks/2013.03.12/slides.pdf","http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705","http://marc.info/?l=bugtraq&m=143039468003789&w=2","http://my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4"],"products":["canonical:ubuntu_linux","fujitsu:m10-1_firmware","fujitsu:m10-4_firmware","fujitsu:m10-4s_firmware","fujitsu:sparc_enterprise_m3000_firmware","fujitsu:sparc_enterprise_m4000_firmware","fujitsu:sparc_enterprise_m5000_firmware","fujitsu:sparc_enterprise_m8000_firmware","fujitsu:sparc_enterprise_m9000_firmware","mozilla:firefox","mozilla:seamonkey","mozilla:thunderbird","mozilla:thunderbird_esr","oracle:communications_application_session_controller","oracle:http_server","oracle:integrated_lights_out_manager_firmware"],"source":"nvd","synced_at":"2026-10-19T20:27:27.940201468+00:00"},"epss":{"cve":"CVE-2013-2566","score":0.84424,"percentile":0.997,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}