CVE-2018-5500

CVE-2018-5500 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-400.

Key facts

• Severity: Medium (CVSS 3.x base score 5.9)
• CVSS v2: 4.3
• EPSS exploit prediction: 1% (70th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-400
• Affected product: F5 Big-ip Local Traffic Manager
• Published: 2018-03-01
• Last modified: 2026-06-17

Description

On F5 BIG-IP systems running 13.0.0, 12.1.0 - 12.1.3.1, or 11.6.1 - 11.6.2, every Multipath TCP (MCTCP) connection established leaks a small amount of memory. Virtual server using TCP profile with Multipath TCP (MCTCP) feature enabled will be affected by this issue.

Frequently asked questions

What is CVE-2018-5500?

On F5 BIG-IP systems running 13.0.0, 12.1.0 - 12.1.3.1, or 11.6.1 - 11.6.2, every Multipath TCP (MCTCP) connection established leaks a small amount of memory. Virtual server using TCP profile with Multipath TCP (MCTCP) feature enabled will be affected by this issue.

How severe is CVE-2018-5500?

CVE-2018-5500 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-2018-5500 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5500?

CVE-2018-5500 primarily affects F5 Big-ip Local Traffic Manager. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-5500?

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

When was CVE-2018-5500 published?

CVE-2018-5500 was published on 2018-03-01 and last updated on 2026-06-17.

References

• http://www.securityfocus.com/bid/103217
• https://support.f5.com/csp/article/K33211839

Affected products (26)

• 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_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:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_edge_gateway: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_webaccelerator:*:*:*:*:*:*:*:*
• cpe:2.3:a:f5:big-ip_webaccelerator:13.0.0:*:*:*:*:*:*:*

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