What is CVE-2021-27791?

CVE-2021-27791 is a vulnerability in Brocade Fabric OS Web application service that allows a client to send a malformed authentication header, resulting in reading memory addresses outside the intended range.

What software versions are affected by CVE-2021-27791?

Brocade Fabric OS versions 8.2.1 to 8.2.3a and 9.0.0 to 9.0.1a are affected by CVE-2021-27791.

How severe is CVE-2021-27791?

CVE-2021-27791 has a severity score of 5.4, classified as medium.

How can I fix CVE-2021-27791?

To fix CVE-2021-27791, users should upgrade Brocade Fabric OS to a version that is not affected by the vulnerability.

Where can I find more information about CVE-2021-27791?

You can find more information about CVE-2021-27791 in the following advisories: [NetApp Advisory](https://security.netapp.com/advisory/ntap-20210819-0002/) and [Brocade Security Advisory](https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1491).

Vulnerability/
CVE-2021-27791

medium

5.5

CWE

125

12/8/2021

3/8/2024

CVE-2021-27791

First published: Thu Aug 12 2021(Updated: )

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.

Credit: sirt@brocade.com

Affected Software	Affected Version	How to fix
Broadcom Fabric Operating System	>=8.2.1<8.2.3a
Broadcom Fabric Operating System	>=9.0.0<9.0.1a

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Frequently Asked Questions

What is CVE-2021-27791?
CVE-2021-27791 is a vulnerability in Brocade Fabric OS Web application service that allows a client to send a malformed authentication header, resulting in reading memory addresses outside the intended range.
What software versions are affected by CVE-2021-27791?
Brocade Fabric OS versions 8.2.1 to 8.2.3a and 9.0.0 to 9.0.1a are affected by CVE-2021-27791.
How severe is CVE-2021-27791?
CVE-2021-27791 has a severity score of 5.4, classified as medium.
How can I fix CVE-2021-27791?
To fix CVE-2021-27791, users should upgrade Brocade Fabric OS to a version that is not affected by the vulnerability.
Where can I find more information about CVE-2021-27791?
You can find more information about CVE-2021-27791 in the following advisories: [NetApp Advisory](https://security.netapp.com/advisory/ntap-20210819-0002/) and [Brocade Security Advisory](https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1491).

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vendor/broadcom
canonical/broadcom fabric operating system
version/broadcom fabric operating system/8.2.1
version/broadcom fabric operating system/9.0.0

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