How severe is CVE-2019-6675?

CVE-2019-6675 has a CVSS 3.x base score of 9.8, 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 high.

Is CVE-2019-6675 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6675?

CVE-2019-6675 primarily affects F5 Big-ip Link Controller. In total, 264 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-6675?

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-2019-6675 published?

CVE-2019-6675 was published on 2019-11-26 and last updated on 2026-06-17.

CVE-2019-6675

CVE-2019-6675 is a critical-severity vulnerability in F5 Big-ip Link Controller with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: F5 Big-ip Link Controller
Published: 2019-11-26
Last modified: 2026-06-17

Description

BIG-IP configurations using Active Directory, LDAP, or Client Certificate LDAP for management authentication with multiple servers are exposed to a vulnerability which allows an authentication bypass. This can result in a complete compromise of the system. This issue only impacts specific engineering hotfixes using the aforementioned authentication configuration. NOTE: This vulnerability does not affect any of the BIG-IP major, minor or maintenance releases you obtained from downloads.f5.com. The affected Engineering Hotfix builds are as follows: Hotfix-BIGIP-14.1.0.3.0.79.6-ENG.iso, Hotfix-BIGIP-14.1.0.3.0.97.6-ENG.iso, Hotfix-BIGIP-14.1.0.3.0.99.6-ENG.iso, Hotfix-BIGIP-14.1.0.5.0.15.5-ENG.iso, Hotfix-BIGIP-14.1.0.5.0.36.5-ENG.iso, Hotfix-BIGIP-14.1.0.5.0.40.5-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.11.9-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.14.9-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.68.9-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.70.9-ENG.iso, Hotfix-BIGIP-14.1.2.0.11.37-ENG.iso, Hotfix-BIGIP-14.1.2.0.18.37-ENG.iso, Hotfix-BIGIP-14.1.2.0.32.37-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.46.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.14.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.16.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.34.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.97.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.99.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.105.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.111.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.115.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.122.4-ENG.iso, Hotfix-BIGIP-15.0.1.0.33.11-ENG.iso, Hotfix-BIGIP-15.0.1.0.48.11-ENG.iso

Frequently asked questions

What is CVE-2019-6675?: BIG-IP configurations using Active Directory, LDAP, or Client Certificate LDAP for management authentication with multiple servers are exposed to a vulnerability which allows an authentication bypass. This can result in a complete compromise of the system. This issue only impacts specific engineering hotfixes using the aforementioned authentication configuration. NOTE: This vulnerability does not affect any of the BIG-IP major, minor or maintenance releases you obtained from downloads.f5.com. The affected Engineering Hotfix builds are as follows: Hotfix-BIGIP-14.1.0.3.0.79.6-ENG.iso, Hotfix-BIGIP-14.1.0.3.0.97.6-ENG.iso, Hotfix-BIGIP-14.1.0.3.0.99.6-ENG.iso, Hotfix-BIGIP-14.1.0.5.0.15.5-ENG.iso, Hotfix-BIGIP-14.1.0.5.0.36.5-ENG.iso, Hotfix-BIGIP-14.1.0.5.0.40.5-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.11.9-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.14.9-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.68.9-ENG.iso, Hotfix-BIGIP-14.1.0.6.0.70.9-ENG.iso, Hotfix-BIGIP-14.1.2.0.11.37-ENG.iso, Hotfix-BIGIP-14.1.2.0.18.37-ENG.iso, Hotfix-BIGIP-14.1.2.0.32.37-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.46.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.14.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.16.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.34.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.97.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.99.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.105.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.111.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.115.4-ENG.iso, Hotfix-BIGIP-14.1.2.1.0.122.4-ENG.iso, Hotfix-BIGIP-15.0.1.0.33.11-ENG.iso, Hotfix-BIGIP-15.0.1.0.48.11-ENG.iso
How severe is CVE-2019-6675?: CVE-2019-6675 has a CVSS 3.x base score of 9.8, 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 high.
Is CVE-2019-6675 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6675?: CVE-2019-6675 primarily affects F5 Big-ip Link Controller. In total, 264 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-6675?: 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-2019-6675 published?: CVE-2019-6675 was published on 2019-11-26 and last updated on 2026-06-17.

References

Affected products (264)

cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.3.0.79.6-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.3.0.97.6-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.3.0.99.6-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.5.0.15.5-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.5.0.36.5-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.5.0.40.5-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.6.0.11.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.6.0.14.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.6.0.68.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.0.6.0.70.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.0.11.37-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.0.18.37-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.0.32.37-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.14.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.16.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.34.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.46.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.97.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.99.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.105.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.111.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.115.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:14.1.2.1.0.122.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.3.0.79.6-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.3.0.97.6-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.3.0.99.6-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.5.0.15.5-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.5.0.36.5-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.5.0.40.5-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.6.0.11.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.6.0.14.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.6.0.68.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0.6.0.70.9-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.2.0.11.37-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.2.0.18.37-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.2.0.32.37-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.2.1.0.14.4-eng_hotfix:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.2.1.0.16.4-eng_hotfix:*:*:*:*:*:*:*

Other CWE-287 (Improper Authentication) vulnerabilities

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