CVE-2026-87661

Persistent web-management outage via corrupted Apache configuration

Published Oct 8, 2026 · Updated Oct 8, 2026

Denial of service in Brocade Fabric OS before 9.2.2d and 10.0.0 through 10.0.0a1 allows attackers to disable the web interface. The Fabric OS Command Access Layer accepts Apache configuration file data directly during service setup or re-initialization, and a corrupted structure blocks service startup. Exploitation requires high-privilege access from the adjacent network and control over that configuration; the administrative web interface remains unavailable across recovery attempts.

CVSS severity6.8
Medium
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Denial of service in Brocade Fabric OS before 9.2.2d and 10.0.0 through 10.0.0a1 allows attackers to disable the web interface. The Fabric OS Command Access Layer accepts Apache configuration file data directly during service setup or re-initialization, and a corrupted structure blocks service startup. Exploitation requires high-privilege access from the adjacent network and control over that configuration; the administrative web interface remains unavailable across recovery attempts.

The record

CVE
CVE-2026-87661
Published
Oct 8, 2026
Updated
Oct 8, 2026
Vendor
Brocade Communications Systems
Product
Fabric OS
Classifications
CWE-93, T1499.004
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Oct 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.2.2d
  2. Affected versionversion=10.0.0 <=10.0.0a1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

Brocade Communications Systems · Fabric OSversion=0 <9.2.2d; version=10.0.0 <=10.0.0a1

Published CVSS scores

6.8Brocade Communications SystemsCVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started