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CVE-2020-27720

HIGH
7.5
CVSS Score
Published: December 24, 2020 at 03:15 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
2 products affected across 1 vendorBig IP Local Traffic ManagerBig IP Carrier Grade Nat

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Big IP Carrier Grade Nat· F5
95%
13.1.0 ≤ v ≤ 13.1.314.1.0 ≤ v < 14.1.3.115.1.0 ≤ v < 15.1.116.0.0 ≤ v < 16.0.113.1.0-13.1.3.514.1.0-14.1.315.1.0-15.1.0.516.0.0-16.0.0.1
Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement
Big IP Local Traffic Manager· F5
95%
13.1.0 ≤ v ≤ 13.1.314.1.0 ≤ v < 14.1.3.115.1.0 ≤ v < 15.1.116.0.0 ≤ v < 16.0.113.1.0-13.1.3.514.1.0-14.1.315.1.0-15.1.0.516.0.0-16.0.0.1
Affected range stops below 14.1.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.1.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://support.f5.com/csp/article/K04048104

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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