What’s Vulnerable › Vulnerabilities

CVE-2021-27791

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-12 · updated 2026-06-17
• Weakness: CWE-125

Description

The function that is used to parse the Authentication header in Brocade Fabric OS Web application service before Brocade Fabric OS v9.0.1a and v8.2.3a fails to properly process a malformed authentication header from the client, resulting in reading memory addresses outside the intended range. An unauthenticated attacker could discover a request, which could bypass the authentication process.

Affected products

• Brocade Fabric OS: from 8.2.1 before 8.2.3a; from 9.0.0 before 9.0.1a — fixed in 8.2.3a, 9.0.1a

How to fix

Upgrade to a fixed version: Brocade Fabric OS 8.2.3a, 9.0.1a. Check the vendor advisory for mitigations.

References

• https://security.netapp.com/advisory/ntap-20210819-0002/
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1491
• https://security.netapp.com/advisory/ntap-20210819-0002/
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1491

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