License forgery in Brocade Fabric OS (FOS) hardware platforms running any version of Brocade Fabric OS software,

published 2023-12-06 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14536

cvss: 6.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

Brocade Fabric OS (FOS) hardware platforms running any version of Brocade Fabric OS software, which supports the license string format; contain cryptographic issues that could allow for the installation of forged or fraudulent license keys. This would allow attackers or a malicious party to forge a counterfeit license key that the Brocade Fabric OS platform would authenticate and activate as if it were a legitimate license key.

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
NVD	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Brocade Brocade Switches

Classification

Weakness

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

support.broadcom.com /web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/21289
vendor-advisory

Sources

CVE List CVE-2021-27795
NVD CVE-2021-27795

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Summary