CVE-2019-6643
CVE-2019-6643 is a high-severity vulnerability in F5 Big-ip Local Traffic Manager with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (68th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: F5 Big-ip Local Traffic Manager
- Published:
- Last modified:
Description
On versions 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.2, 12.1.0-12.1.4.1, and 11.5.2-11.6.4, an attacker sending specifically crafted DHCPv6 requests through a BIG-IP virtual server configured with a DHCPv6 profile may be able to cause the TMM process to produce a core file.
Frequently asked questions
- What is CVE-2019-6643?
- On versions 14.1.0-14.1.0.5, 14.0.0-14.0.0.4, 13.0.0-13.1.2, 12.1.0-12.1.4.1, and 11.5.2-11.6.4, an attacker sending specifically crafted DHCPv6 requests through a BIG-IP virtual server configured with a DHCPv6 profile may be able to cause the TMM process to produce a core file.
- How severe is CVE-2019-6643?
- CVE-2019-6643 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2019-6643 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-6643?
- CVE-2019-6643 primarily affects F5 Big-ip Local Traffic Manager. In total, 39 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2019-6643?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2019-6643 published?
- CVE-2019-6643 was published on 2019-09-04 and last updated on 2026-06-17.
References
- https://support.f5.com/csp/article/K36228121
- https://support.f5.com/csp/article/K36228121?utm_source=f5support&%3Butm_medium=RSS
Affected products (39)
- cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_local_traffic_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_local_traffic_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_advanced_firewall_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_acceleration_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_analytics:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_access_policy_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_application_security_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_edge_gateway:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_edge_gateway:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_fraud_protection_service:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_fraud_protection_service:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_global_traffic_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_global_traffic_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_link_controller:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_policy_enforcement_manager:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_webaccelerator:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_webaccelerator:14.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:14.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:big-ip_domain_name_system:14.1.0:*:*:*:*:*:*:*
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