High severity · published Dec 24, 2020
CVE-2020-27720
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…
7.5
CVSS
1.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BC
Big-ip Carrier-grade Nat · F5
13.1.0 through 13.1.3; 14.1.0 before 14.1.3.1; 15.1.0 before 15.1.1; 16.0.0 before 16.0.1 · source: NVD
BL
Big-ip Local Traffic Manager · F5
13.1.0 through 13.1.3; 14.1.0 before 14.1.3.1; 15.1.0 before 15.1.1; 16.0.0 before 16.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27720
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-27720
Vendor Advisory
https://support.f5.com/csp/article/K04048104
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