CVE-2025-1976
CVE-2025-1976 is a security flaw in Broadcom Brocade Fabric OS. Someone who already has a way in can use Broadcom Brocade Fabric OS to run their own code. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 28 Apr 2025.[1]
Broadcom Brocade Fabric OS is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Broadcom has published a fix or advice.
Description
CISA calls it a code injection in Broadcom Brocade Fabric OS. In its words: “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.”[1]
The CVE record adds: “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.”[2]
The underlying weakness is code injection (CWE-94), in MITRE’s list of common software weaknesses.
It scores 6.7 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; Broadcom’s advisory has them[3]. CISA names the product as Broadcom Brocade Fabric OS.
Most families won’t have Broadcom Brocade Fabric OS; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 28 Apr 2025, 4 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 19 May 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at under 1%. That’s in the top 48% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Broadcom has published a fix or advice.[3] CISA’s 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.”[1]
- Check whether you use it.Broadcom Brocade Fabric OS is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 19 May 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 6.7.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at under 1%.[4] |
See also
Other Broadcom flaws
- CVE-2026-41709, Broadcom VMware ESX: insufficient logging ·
- CVE-2026-59310, Broadcom VMware vCenter: path traversal ·
- CVE-2026-22719, Broadcom VMware Aria Operations: command injection ·
- CVE-2024-37079, Broadcom VMware vCenter Server: out-of-bounds write ·
- CVE-2025-41244, Broadcom VMware Aria Operations and VMware Tools: privilege defined with unsafe actions ·
Other code injection flaws
- CVE-2026-0322, Palo Alto Networks PAN-OS: code injection ·
- CVE-2026-65660, Microsoft SharePoint: code injection ·
- CVE-2026-60004, Gitea: code injection ·
- CVE-2026-72530, TrueConf Server: code injection ·
- CVE-2025-62593, Ray-Project Ray: code injection ·
Added the same day
- CVE-2025-42599, Qualitia Active! Mail: stack-based buffer overflow ·
- CVE-2025-3928, Commvault Web Server: unspecified ·
Every Broadcom flaw on CISA’s list · Everything added in April 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “Broadcom Brocade Fabric OS Code Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 28 Apr 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-1976 Detail”. National Vulnerability Database, published 24 Apr 2025.
- ^ Broadcom. Advisories and fixes: support.broadcom.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.007, percentile 52.8, 31 Oct 2026.
- CVE Program. “CVE-2025-1976”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.