How severe is CVE-2021-23005?

CVE-2021-23005 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-23005 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23005?

CVE-2021-23005 affects F5 Big-iq Centralized Management. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23005?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-23005 published?

CVE-2021-23005 was published on 2021-03-31 and last updated on 2026-06-17.

CVE-2021-23005

CVE-2021-23005 is a critical-severity vulnerability in F5 Big-iq Centralized Management with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: F5 Big-iq Centralized Management
Published: 2021-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-23005?: 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.
How severe is CVE-2021-23005?: CVE-2021-23005 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-23005 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23005?: CVE-2021-23005 affects F5 Big-iq Centralized Management. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23005?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-23005 published?: CVE-2021-23005 was published on 2021-03-31 and last updated on 2026-06-17.

References

https://support.f5.com/csp/article/K01243064

Affected products (1)

cpe:2.3:a:f5:big-iq_centralized_management:*:*:*:*:*:*:*:*

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