CVE-2017-6227

A vulnerability in the IPv6 stack on Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) versions before 7.4.2b, 8.1.2 and 8.2.0 could allow an attacker to cause a denial of service (CPU consumption and device hang) condition by sending crafted Router Advertisement (RA) messages to a targeted system.

Published: 2018-02-08 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-6227 is rated Moderate Risk (41/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.55%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-6227

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.08% 0.55% +0.47%
2 2026-05-23 0.40% 0.08% -0.31%
3 2026-02-28 — 0.40% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-6227

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
6.1 2.0 MEDIUM
AV:A/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 6.5 6.9 [email protected]

Weakness enumeration for CVE-2017-6227

Affected software / configurations for CVE-2017-6227

Vendor Product Version Raw CPE
broadcom fabric_operating_system < 7.4.2b cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:*
broadcom fabric_operating_system 8.0.0 cpe:2.3:o:broadcom:fabric_operating_system:8.0.0:*:*:*:*:*:*:*
broadcom fabric_operating_system 8.0.1 cpe:2.3:o:broadcom:fabric_operating_system:8.0.1:*:*:*:*:*:*:*
broadcom fabric_operating_system 8.0.2 cpe:2.3:o:broadcom:fabric_operating_system:8.0.2:*:*:*:*:*:*:*
broadcom fabric_operating_system 8.1.0 cpe:2.3:o:broadcom:fabric_operating_system:8.1.0:*:*:*:*:*:*:*
broadcom fabric_operating_system 8.1.1 cpe:2.3:o:broadcom:fabric_operating_system:8.1.1:*:*:*:*:*:*:*
broadcom fabric_operating_system 8.1.2 cpe:2.3:o:broadcom:fabric_operating_system:8.1.2:*:*:*:*:*:*:*
brocade fabric_os 8.0.2b2 cpe:2.3:o:brocade:fabric_os:8.0.2b2:*:*:*:*:*:*:*

References for CVE-2017-6227

cvelogic Threat Intelligence