CVE-2017-6136

CVE-2017-6136 is a medium-severity vulnerability in F5 Big-ip Local Traffic Manager with a CVSS 3.x base score of 5.9. 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-20.

Key facts

• Severity: Medium (CVSS 3.x base score 5.9)
• CVSS v2: 4.3
• EPSS exploit prediction: 1% (69th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: F5 Big-ip Local Traffic Manager
• Published: 2017-12-21
• Last modified: 2026-06-17

Description

In F5 BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, GTM, Link Controller, PEM and WebSafe software version 13.0.0 and 12.0.0 - 12.1.2, undisclosed traffic patterns sent to BIG-IP virtual servers, with the TCP Fast Open and Tail Loss Probe options enabled in the associated TCP profile, may cause a disruption of service to the Traffic Management Microkernel (TMM).

Frequently asked questions

What is CVE-2017-6136?

In F5 BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, GTM, Link Controller, PEM and WebSafe software version 13.0.0 and 12.0.0 - 12.1.2, undisclosed traffic patterns sent to BIG-IP virtual servers, with the TCP Fast Open and Tail Loss Probe options enabled in the associated TCP profile, may cause a disruption of service to the Traffic Management Microkernel (TMM).

How severe is CVE-2017-6136?

CVE-2017-6136 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-6136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6136?

CVE-2017-6136 primarily affects F5 Big-ip Local Traffic Manager. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-6136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-6136 published?

CVE-2017-6136 was published on 2017-12-21 and last updated on 2026-06-17.

References

• http://www.securitytracker.com/id/1040046
• https://support.f5.com/csp/article/K81137982

Affected products (22)

• cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_local_traffic_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_application_acceleration_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_advanced_firewall_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_analytics:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_access_policy_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_application_security_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_dns:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_dns:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_global_traffic_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_link_controller:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_policy_enforcement_manager:13.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_websafe:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_websafe:13.0.0:*:*:*:*:*:*:*

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