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CVSS 10.0CVSS 10.0 · CRITICAL

CVE-2015-2808

The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic that occasionally relies on keys affected by the Invariance Weakness, and then using a brute-force approach involving LSB values, aka the "Bar Mitzvah" issue.

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Severity

Score: 10.0(CRITICAL)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
AV: NETWORK
AC: LOW
PR: NONE
UI: NONE
S: CHANGED
C: HIGH
I: HIGH
A: HIGH
Weakness (CWE): CWE-327

EPSS

Probability of exploitation (next 30 days): 0.3749 (37.5%)
Percentile: 97.2%
EPSS: 2026-05-27

Affects

oracle:communications_application_session_controlleroracle:communications_policy_managementoracle:http_serveroracle:integrated_lights_out_manager_firmwaredebian:debian_linuxredhat:satelliteredhat:enterprise_linux_desktopredhat:enterprise_linux_eusredhat:enterprise_linux_serverredhat:enterprise_linux_server_ausredhat:enterprise_linux_server_tusredhat:enterprise_linux_workstationsuse:linux_enterprise_debuginfoopensuse:opensusesuse:linux_enterprise_desktopsuse:linux_enterprise_serversuse:linux_enterprise_software_development_kitsuse:managercanonical:ubuntu_linuxredhat:enterprise_linuxfujitsu:sparc_enterprise_m3000_firmwarefujitsu:sparc_enterprise_m3000fujitsu:sparc_enterprise_m4000_firmwarefujitsu:sparc_enterprise_m4000fujitsu:sparc_enterprise_m5000_firmwarefujitsu:sparc_enterprise_m5000fujitsu:sparc_enterprise_m8000_firmwarefujitsu:sparc_enterprise_m8000fujitsu:sparc_enterprise_m9000_firmwarefujitsu:sparc_enterprise_m9000huawei:e6000_firmwarehuawei:e6000huawei:e9000_firmwarehuawei:e9000huawei:oceanstor_18500_firmwarehuawei:oceanstor_18500huawei:oceanstor_18800_firmwarehuawei:oceanstor_18800huawei:oceanstor_18800f_firmwarehuawei:oceanstor_18800fhuawei:oceanstor_9000_firmwarehuawei:oceanstor_9000huawei:oceanstor_cse_firmwarehuawei:oceanstor_csehuawei:oceanstor_hvs85t_firmwarehuawei:oceanstor_hvs85thuawei:oceanstor_s2600t_firmwarehuawei:oceanstor_s2600thuawei:oceanstor_s5500t_firmwarehuawei:oceanstor_s5500thuawei:oceanstor_s5600t_firmwarehuawei:oceanstor_s5600thuawei:oceanstor_s5800t_firmwarehuawei:oceanstor_s5800thuawei:oceanstor_s6800t_firmwarehuawei:oceanstor_s6800thuawei:oceanstor_vis6600t_firmwarehuawei:oceanstor_vis6600thuawei:quidway_s9300_firmwarehuawei:quidway_s9300huawei:s7700_firmwarehuawei:s7700huawei:9700_firmwarehuawei:9700huawei:s12700_firmwarehuawei:s12700huawei:s2700_firmwarehuawei:s2700huawei:s3700_firmwarehuawei:s3700huawei:s5700ei_firmwarehuawei:s5700eihuawei:s5700hi_firmwarehuawei:s5700hihuawei:s5700si_firmwarehuawei:s5700sihuawei:s5710ei_firmwarehuawei:s5710eihuawei:s5710hi_firmwarehuawei:s5710hihuawei:s6700_firmwarehuawei:s6700huawei:s2750_firmwarehuawei:s2750huawei:s5700li_firmwarehuawei:s5700lihuawei:s5700s-li_firmwarehuawei:s5700s-lihuawei:s5720hi_firmwarehuawei:s5720hihuawei:s5720ei_firmwarehuawei:s5720eihuawei:te60_firmwarehuawei:te60huawei:oceanstor_replicationdirectorhuawei:policy_centerhuawei:smc2.0huawei:ultravribm:cognos_metrics_manager

Technical description

The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic that occasionally relies on keys affected by the Invariance Weakness, and then using a brute-force approach involving LSB values, aka the "Bar Mitzvah" issue.

Published: 4/1/2015, 2:00:35 AM
Last modified: 5/27/2026, 6:16:19 PM

References

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