CVE-2021-23005

Name: CVE-2021-23005
Creator: NVD / NIST
Published: 2021-03-31T18:15:15.567+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2021-23005 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. On all 7.x and 6.x versions (fixed in 8.0.0), when using a Quorum device for BIG-IQ high availability (HA) for automatic failover, BIG-IQ does not make use of Transport Layer Security (TLS) with the Corosync protocol. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

On all 7.x and 6.x versions (fixed in 8.0.0), when using a Quorum device for BIG-IQ high availability (HA) for automatic failover, BIG-IQ does not make use of Transport Layer Security (TLS) with the Corosync protocol. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.00%

58.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
F5	Big-Iq Centralized Management	>= 6.0.0, < 8.0.0

References

https://support.f5.com/csp/article/K01243064Vendor Advisory
https://support.f5.com/csp/article/K01243064Vendor Advisory

Timeline

Published: Mar 31, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23005?

How severe is CVE-2021-23005?

CVE-2021-23005 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23005?

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-2021-23005?

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

Scan your code now

Source: NVD / NIST