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CVE-2026-87665

7.5, high

Brocade Fabric OS Stack-based Buffer Overflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.8% higher than 55.3% of scored CVEs
Exploitation
No public evidence
Published
8 Oct 20269 days ago

Description

A stack-based buffer overflow vulnerability exists in the Internet Key Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1. The vulnerability occurs when processing initial IKE key exchange requests on extension switches or blades running IPsec-enabled Fibre Channel over IP (FCIP) circuits. An unauthenticated remote attacker can exploit this vulnerability by sending a single, specifically crafted UDP packet (Port 500) containing an oversized Nonce payload. Successful exploitation results in a denial of service (data-plane process crash)

Details

Vendor
Brocade
Product
Fabric OS
Weakness
CWE-121 (opens in a new tab)
Status
Analyzed
Updated
13 Oct 2026
Assigner
sirt@brocade.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References 1

Advisories 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Brocade CVEs

Every Brocade CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-87659 Brocade Fabric OS Missing Authentication for Critical Function Vulnerability EPSS 0.2% 9.8, critical
  • CVE-2026-87679 Brocade Fabric OS Heap-based Buffer Overflow Vulnerability EPSS 0.4% 7.2, high
  • CVE-2026-87680 Brocade Fabric OS OS Command Injection Vulnerability EPSS 2% 8.8, high
  • CVE-2026-87682 Brocade Fabric OS OS Command Injection Vulnerability EPSS 2% 8.8, high
  • CVE-2026-87683 Brocade Fabric OS Stack-based Buffer Overflow Vulnerability EPSS 0.5% 8.8, high
  • CVE-2026-87671 Brocade Fabric OS Out-of-Bounds Read Vulnerability EPSS 0.4% 7.5, high
  • CVE-2026-87684 Brocade Fabric OS Stack-based Buffer Overflow Vulnerability EPSS 0.6% 9.8, critical
  • CVE-2026-94578 Brocade Fabric OS Improper Privilege Management Vulnerability EPSS 0.4% 8.8, high

Beyond this page

Is CVE-2026-87665 in your network?

This page tells you how dangerous CVE-2026-87665 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.