CVE-2025-1976: Broadcom Brocade Fabric OS

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

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.

CISA’s summary

Broadcom Brocade Fabric OS contains a code injection vulnerability that allows a local user with administrative privileges to execute arbitrary code with full root privileges.

Weakness type: CWE-94.

Product: Broadcom Brocade Fabric OS · Assigned by: brocade · Published: 2025-04-24

Affected and fixed versions

Vendor	Product	Affected versions (per CVE record)
Brocade	Fabric OS	Fabric OS versions 9.1.0 through 9.1.1d6

Severity scores

Scored by	CVSS	Score	Vector
brocade	4.0	8.6 High	`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`

Attack vector: adjacent network only
Attack complexity: low
Attack requirements: none
Privileges required: low (any account)
User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

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.

Timeline

2025-04-24 — CVE record published by brocade
2025-04-28 — Added to CISA’s Known Exploited Vulnerabilities catalog
2025-05-19 — CISA remediation deadline for US federal agencies
2026-02-26 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.