How severe is CVE-2017-6227?

CVE-2017-6227 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-6227 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6227?

CVE-2017-6227 primarily affects Brocade Fabric Os. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-6227?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-6227 published?

CVE-2017-6227 was published on 2018-02-08 and last updated on 2026-06-17.

CVE-2017-6227

CVE-2017-6227 is a medium-severity vulnerability in Brocade Fabric Os with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.1
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Brocade Fabric Os
Published: 2018-02-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2017-6227?: CVE-2017-6227 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-6227 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6227?: CVE-2017-6227 primarily affects Brocade Fabric Os. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-6227?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-6227 published?: CVE-2017-6227 was published on 2018-02-08 and last updated on 2026-06-17.

References

https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2018-526

Affected products (8)

cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:fabric_operating_system:8.0.0:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:fabric_operating_system:8.0.1:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:fabric_operating_system:8.0.2:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:fabric_operating_system:8.1.0:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:fabric_operating_system:8.1.1:*:*:*:*:*:*:*
cpe:2.3:o:broadcom:fabric_operating_system:8.1.2:*:*:*:*:*:*:*
cpe:2.3:o:brocade:fabric_os:8.0.2b2:*:*:*:*:*:*:*

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