CVE-2020-27720

7.5 highEPSS 1.4%

High (7.5) in f5. EPSS 1.4% chance of exploitation in the next 30 days.

On BIG-IP LTM/CGNAT version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.5, when processing NAT66 traffic with Port Block Allocation (PBA) mode and SP-DAG enabled, and dag-ipv6-prefix-len configured with a value less than the default of 128, an undisclosed traffic pattern may cause the Traffic Management Microkernel (TMM) to restart.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 1.4% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
Published: 2020-12-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

f5:big-ip_carrier-grade_nat
f5:big-ip_local_traffic_manager

References

https://support.f5.com/csp/article/K04048104
https://support.f5.com/csp/article/K04048104

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