---
title: "CVE-2025-1976: Broadcom Brocade Fabric OS Code Injection Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-1976/
description: "CVE-2025-1976 (Broadcom Brocade Fabric OS): Exploited in the wild (CISA KEV). Brocade Fabric OS versions starting with 9.1.0 have root access removed…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-04-24
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-1976"
kev: true
cvss: 8.6
epss: 0.0069
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-1976: Broadcom Brocade Fabric OS Code Injection Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Broadcom Brocade Fabric OS. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-04-28, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-05-19 ; treat that as the outer limit, not the target.
- EPSS 0.7% , percentile 52: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 52% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.

## What it is

Brocade Fabric OS versions starting with 9.1.0 have root access removed, however, a local user with admin privilege can potentially execute arbitrary code with full root privileges on Fabric OS versions 9.1.0 through 9.1.1d6.

## Affected products (CVE record)

- Brocade Fabric OS: Fabric OS versions 9.1.0 through 9.1.1d6

## Severity

- brocade CVSS 4.0: 8.6 `CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: added 2025-04-28; federal due date 2025-05-19. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.69% probability of exploitation activity in the next 30 days; percentile 52.

## Sources

- [Listed in CISA KEV notes (support.broadcom.com)](https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25602)
- [CVE.org record CVE-2025-1976](https://www.cve.org/CVERecord?id=CVE-2025-1976)
- [NVD entry CVE-2025-1976](https://nvd.nist.gov/vuln/detail/CVE-2025-1976)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-1976)

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Source page: https://erroneo.us/security/cve/CVE-2025-1976/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt