No exploitation reportedFix available

CVE-2018-6440

Q: Is CVE-2018-6440 actively exploited?

Active exploitation of CVE-2018-6440 has not been confirmed. Its EPSS score was 2.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-6440?

CVE-2018-6440 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

No exploitation reported by the sources we read.

Published2018-12-03
Fixed in8.2.1 · 8.1.2f · 8.0.2f · 7.4.2d

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the proxy service of Brocade Fabric OS versions before 8.2.1, 8.1.2f, 8.0.2f, 7.4.2d could allow remote unauthenticated attackers to obtain sensitive information and possibly cause a denial of service attack.

Timeline

dates in UTC

2018-12-0321:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-6440?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-6440?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Broadcom fabric operating system

Branch	Affected	Fixed in	Source
8.2	≥ 8.2.0, < 8.2.1	8.2.1	NVD
8.1	≥ 8.1.2, < 8.1.2f	8.1.2f	NVD
8.0	≥ 8.0.2, < 8.0.2f	8.0.2f	NVD
7.4	≥ 7.4.2, < 7.4.2d	7.4.2d	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Broadcom fabric operating system to 8.2.1 · 8.1.2f · 8.0.2f · 7.4.2d

Advisories and patches

www.broadcom.comMitigation

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.09.1read 2026-10-23
NVDCVSS 2.06.4read 2026-10-23
FIRST EPSSEPSS score2.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published: 2018-12-03
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-6440?

Is CVE-2018-6440 actively exploited?

Active exploitation of CVE-2018-6440 has not been confirmed. Its EPSS score was 2.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-6440?

CVE-2018-6440 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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