CVE-2026-87665: CWE-121: Stack-based Buffer Overflow in Brocade Fabric OS
Description
CVE-2026-87665 is a stack-based buffer overflow vulnerability in the Internet Key Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1. It affects extension switches or blades running IPsec-enabled Fibre Channel over IP (FCIP) circuits. An unauthenticated remote attacker can exploit this by sending a crafted UDP packet on port 500 with an oversized Nonce payload, causing a denial of service due to a data-plane process crash.
CVSS v4.0
Score 6.0medium
Affected software
Brocade
Fabric OS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-121) exists in the IKEv2 protocol handler of Brocade Fabric OS prior to version 10.0.1. When processing initial IKE key exchange requests on IPsec-enabled FCIP circuits, the handler does not properly validate the size of the Nonce payload in UDP packets on port 500. An attacker can send a single crafted packet to trigger a stack-based buffer overflow, resulting in a crash of the data-plane process and denial of service.
Potential Impact
Successful exploitation leads to denial of service by crashing the data-plane process on affected devices. There is no indication of code execution or data disclosure. The attacker does not require authentication and only needs network access to UDP port 500 on the target device.
Mitigation Recommendations
No official patch or fix information is provided in the vendor advisory. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to UDP port 500 on affected devices to trusted sources only to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- brocade
- Date Reserved
- 2026-09-08T22:51:12.106Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac70ba22cdf04f656d9e1ac
Added to database: 10/08/2026, 03:18:58 UTC
Last enriched: 10/08/2026, 03:33:27 UTC
Last updated: 10/08/2026, 03:33:52 UTC
Views: 3
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