Security readout for executives and security teams
Plain-English summary
Some Brocade Fabric OS versions allowed login with empty or invalid passwords over management interfaces. For executives, this means an exposed Fibre Channel switch could be accessed without valid credentials, risking control of storage networking. The supplied bundle does not include CVSS details.
Executive priority
Treat this as high priority for storage networking environments. The issue affects authentication to infrastructure that can influence business-critical storage connectivity. Prioritize internet- or broad-network-reachable management planes first.
Technical view
The CVE describes an authentication mechanism flaw in Brocade Fabric OS before 9.0.1a, 8.2.3a, and 7.4.2h. Access paths named are telnet, SSH, and REST. The bundle lists no CWE or CVSS vector, so privilege and configuration prerequisites are not fully evidenced here.
Likely exposure
Organizations using Brocade Fibre Channel switches running Fabric OS older than 9.0.1a, 8.2.3a, or 7.4.2h are the likely exposure group, especially where management services are reachable beyond tightly controlled admin networks.
Exploitation context
The supplied sources say login may be possible with empty or invalid passwords through telnet, SSH, and REST. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation.
Researcher notes
The record is sparse: no CVSS, CWE, or exploit details are present in the supplied bundle. Analysis should stay centered on affected Fabric OS branches, named access protocols, and vendor advisory confirmation. Do not infer other Brocade products without source support.
Mitigation direction
- Upgrade Fabric OS to 9.0.1a, 8.2.3a, 7.4.2h, or vendor-supported later releases.
- Review Broadcom guidance for platform-specific upgrade paths and operational prerequisites.
- Restrict telnet, SSH, and REST management access to trusted administrative networks only.
- Disable unused management protocols where supported by vendor configuration guidance.
- Check NetApp guidance if Brocade equipment is embedded in supported NetApp environments.
Validation and detection
- Inventory Brocade Fabric OS versions across Fibre Channel switching infrastructure.
- Confirm no device runs Fabric OS earlier than the fixed release for its branch.
- Review exposed management services: telnet, SSH, and REST.
- Verify management interfaces are not reachable from untrusted networks.
- Check authentication logs for unusual successful logins or failed password patterns.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-27794 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1552CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210819-0001/CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.