CVE-2021-27793

Name: CVE-2021-27793
Creator: NVD / NIST
Published: 2021-08-12T15:15:07.817+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2021-27793 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. ntermittent authorization failure in aaa tacacs+ with Brocade Fabric OS versions before Brocade Fabric OS v9.0.1b and after 9.0.0, also in Brocade Fabric OS before Brocade Fabric OS v8.2.3a and after v8.2.0 could cause a user with a valid account to be unable to log into the switch.. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

Description

ntermittent authorization failure in aaa tacacs+ with Brocade Fabric OS versions before Brocade Fabric OS v9.0.1b and after 9.0.0, also in Brocade Fabric OS before Brocade Fabric OS v8.2.3a and after v8.2.0 could cause a user with a valid account to be unable to log into the switch.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.91%

55.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Broadcom	Fabric Operating System	>= 8.2.0, < 8.2.3
Broadcom	Fabric Operating System	>= 9.0.0, < 9.0.1
Broadcom	Fabric Operating System	8.2.3
Broadcom	Fabric Operating System	9.0.1
Broadcom	Fabric Operating System	9.0.1a

References

https://security.netapp.com/advisory/ntap-20210819-0001/Third Party Advisory
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1553Vendor Advisory
https://security.netapp.com/advisory/ntap-20210819-0001/Third Party Advisory
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1553Vendor Advisory

Timeline

Published: Aug 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27793?

How severe is CVE-2021-27793?

CVE-2021-27793 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27793?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27793?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST