CVE-2018-15311
UnknownEPSS 1.42%
Last modified
CVE-2018-15311 is a vulnerability of currently unknown severity. When F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.5.1-11.5.6 is processing specially crafted TCP traffic with the Large Receive Offload (LRO) feature enabled, TMM may crash, leading to a failover event. This vulnerability is not exposed unless LRO is enabled, so most affected customers will be on 13.1.x. EPSS estimates a 1.42% chance of exploitation in the next 30 days.
Description
When F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.5.1-11.5.6 is processing specially crafted TCP traffic with the Large Receive Offload (LRO) feature enabled, TMM may crash, leading to a failover event. This vulnerability is not exposed unless LRO is enabled, so most affected customers will be on 13.1.x. LRO has been available since 11.4.0 but is not enabled by default until 13.1.0.
Metrics
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Local Traffic Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Local Traffic Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Local Traffic Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Local Traffic Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Application Acceleration Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Application Acceleration Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Advanced Firewall Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Advanced Firewall Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Analytics | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Analytics | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Analytics | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Analytics | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Access Policy Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Access Policy Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Access Policy Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Access Policy Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Application Security Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Application Security Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Application Security Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Application Security Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Domain Name System | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Domain Name System | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Domain Name System | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Domain Name System | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Edge Gateway | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Edge Gateway | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Edge Gateway | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Edge Gateway | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Fraud Protection Service | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Fraud Protection Service | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Fraud Protection Service | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Fraud Protection Service | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Global Traffic Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Global Traffic Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Global Traffic Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Global Traffic Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Link Controller | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Link Controller | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Link Controller | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Link Controller | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Policy Enforcement Manager | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Policy Enforcement Manager | >= 11.6.0.0, <= 11.6.3.2 |
| F5 | Big-Ip Policy Enforcement Manager | >= 12.1.0.0, <= 12.1.3.5 |
| F5 | Big-Ip Policy Enforcement Manager | >= 13.0.0.0, <= 13.1.0.5 |
| F5 | Big-Ip Webaccelerator | >= 11.5.1, <= 11.5.6 |
| F5 | Big-Ip Webaccelerator | >= 11.6.0.0, <= 11.6.3.2 |
Showing 50 of 52 affected configurations. See NVD for the full list.
References
- https://support.f5.com/csp/article/K07550539Mitigation, Vendor Advisory
- https://support.f5.com/csp/article/K07550539Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2018-15311?
When F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.5.1-11.5.6 is processing specially crafted TCP traffic with the Large Receive Offload (LRO) feature enabled, TMM may crash, leading to a failover event. This vulnerability is not exposed unless LRO is enabled, so most affected customers will be on 13.1.x. LRO has been available since 11.4.0 but is not enabled by default until 13.1.0.
How severe is CVE-2018-15311?
Severity scoring for CVE-2018-15311 is pending analysis. The EPSS model estimates a 1.42% probability of exploitation in the next 30 days.
How do I fix CVE-2018-15311?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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