CVE-2026-87665: A stack-based buffer overflow vulnerability exists in the Internet Key Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1 | LiveThreat CVE Feed — Verisq

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High severity · published Oct 8, 2026

CVE-2026-87665

A stack-based buffer overflow vulnerability exists in the Internet Key Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1

7.5

CVSS

0.8%

EPSS

No

On KEV

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)

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.8% · higher than 56% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

FO

Fabric OS · Brocade

before 10.0.1 · source: vendor

FO

Fabric Operating System · Broadcom

before 10.0.1 · source: NVD

Affected product

FO

Fabric OS

Brocade

All Fabric OS CVEs

References

https://nvd.nist.gov/vuln/detail/CVE-2026-87665

https://www.cve.org/CVERecord?id=CVE-2026-87665

support.broadcom.com

https://support.broadcom.com/external/content/SecurityAdvisories/0/39148

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