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CVE-2018-6439

25
FAUCET Score

CVE-2018-6439 describes a critical vulnerability in the Brocade Fabric OS command line interface (CLI) affecting versions prior to 8.2.1, 8.1.2f, 8.0.2f, and 7.4.2d. A local attacker can exploit a flaw in the configdownload command to escape the restricted shell and gain root access to the system. With a CVSS score of 7.8 (HIGH), this vulnerability allows for complete compromise of confidentiality, integrity, and availability with low attack complexity and no user interaction required. Despite its severity, there is no known active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.4.2, < 7.4.2dCPE matchmatch criteria
cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:*
>= 8.0.2, < 8.0.2fCPE matchmatch criteria
cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:*
>= 8.1.2, < 8.1.2fCPE matchmatch criteria
cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:*
>= 8.2.0, < 8.2.1CPE matchmatch criteria
cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 66th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

broadcom.com / support/fibre-channel-networking/security-advisories/brocade-security-advisory-2018-730
Vendor Advisory