How severe is CVE-2016-9253?

CVE-2016-9253 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-2016-9253 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-2016-9253?

CVE-2016-9253 primarily affects F5 Big-ip Local Traffic Manager. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-9253?

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-2016-9253 published?

CVE-2016-9253 was published on 2017-05-09 and last updated on 2026-06-17.

CVE-2016-9253

CVE-2016-9253 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. The underlying weakness is classified as CWE-20.

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
Weakness: CWE-20
Affected product: F5 Big-ip Local Traffic Manager
Published: 2017-05-09
Last modified: 2026-06-17

Description

In F5 BIG-IP 12.1.0 through 12.1.2, specific websocket traffic patterns may cause a disruption of service for virtual servers configured to use the websocket profile.

Frequently asked questions

What is CVE-2016-9253?: In F5 BIG-IP 12.1.0 through 12.1.2, specific websocket traffic patterns may cause a disruption of service for virtual servers configured to use the websocket profile.
How severe is CVE-2016-9253?: CVE-2016-9253 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-2016-9253 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-2016-9253?: CVE-2016-9253 primarily affects F5 Big-ip Local Traffic Manager. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-9253?: 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-2016-9253 published?: CVE-2016-9253 was published on 2017-05-09 and last updated on 2026-06-17.

References

Affected products (30)

cpe:2.3:a:f5:big-ip_local_traffic_manager:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_local_traffic_manager:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_local_traffic_manager:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_acceleration_manager:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_analytics:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_analytics:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_analytics:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_security_manager:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_security_manager:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_security_manager:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_domain_name_system:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_domain_name_system:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_domain_name_system:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_link_controller:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_policy_enforcement_manager:12.1.2:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_websafe:12.1.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_websafe:12.1.1:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_websafe:12.1.2:*:*:*:*:*:*:*

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