CVE-2018-15311

moderate-risk
Published 2018-10-10

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.

Do I need to act?

~
3.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (13)

Affected Vendors

F5

References (2)

Mitigation https://support.f5.com/csp/article/K07550539
Mitigation https://support.f5.com/csp/article/K07550539
42
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 7/34 · Low
Exposure 17/34 · Moderate