CVE-2026-87665

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-08 · updated 2026-10-13
Weakness: CWE-121

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)

Affected products

Brocade Fabric OS: before 10.0.1 — fixed in 10.0.1

How to fix

Upgrade to a fixed version: Brocade Fabric OS 10.0.1. Check the vendor advisory for mitigations.

References

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

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