On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.3, 13.1.x before 13.1.4.1, and all versions of 12.1.…

published 2021-09-14 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10166

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 14.1.x before 14.1.4.3, 13.1.x before 13.1.4.1, and all versions of 12.1.x and 11.6.x, when GPRS Tunneling Protocol (GTP) iRules commands or a GTP profile is configured on a virtual server, undisclosed GTP messages can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Patch / fix

fixed in 11

f5 big-ip_access_policy_manager 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_advanced_firewall_manager 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_advanced_web_application_firewall 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_analytics 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_application_acceleration_manager 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_application_security_manager 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_domain_name_system 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_fraud_protection_service 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_global_traffic_manager 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_link_controller 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2
f5 big-ip_local_traffic_manager 13.1.4.1, 14.1.4.3, 15.1.3.1, 16.0.1.2

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a BIG-IP

Classification

Weakness

CWE-20 Improper Input Validation

References

support.f5.com /csp/article/K19012930
vendor-advisory

Sources

CVE List CVE-2021-23048
NVD CVE-2021-23048

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary