CVE-2020-27721

published 2020-12-24

CVE-2020-27721: In versions 16.0.0-16.0.0.1, 15.1.0-15.1.1, 14.1.0-14.1.3, 13.1.0-13.1.3.5, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, in a BIG-IP DNS / BIG-IP LTM GSLB deployment…

Priority P3 38 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

In versions 16.0.0-16.0.0.1, 15.1.0-15.1.1, 14.1.0-14.1.3, 13.1.0-13.1.3.5, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, in a BIG-IP DNS / BIG-IP LTM GSLB deployment, under certain circumstances, the BIG-IP DNS system may stop using a BIG-IP LTM virtual server for DNS response.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
f5	big-ip_dns	—	—
f5	big-ip_domain_name_system	11.6.1 – 11.6.5	—
f5	big-ip_domain_name_system	12.1.0 – 12.1.5	—
f5	big-ip_domain_name_system	13.1.0 – 13.1.3	—
f5	big-ip_domain_name_system	>= 14.1.0 < 14.1.3.1	14.1.3.1
f5	big-ip_domain_name_system	>= 15.0.0 < 15.1.2	15.1.2
f5	big-ip_domain_name_system	>= 16.0.0 < 16.0.1	16.0.1
f5	big-ip_global_traffic_manager	11.6.1 – 11.6.5	—
f5	big-ip_global_traffic_manager	12.1.0 – 12.1.5	—
f5	big-ip_global_traffic_manager	13.1.0 – 13.1.3	—
f5	big-ip_global_traffic_manager	>= 14.1.0 < 14.1.3.1	14.1.3.1
f5	big-ip_global_traffic_manager	>= 15.0.0 < 15.1.2	15.1.2
f5	big-ip_global_traffic_manager	>= 16.0.0 < 16.0.1	16.0.1
f5	big-ip_gtm	—	—
f5	big-ip_ltm	—	—

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v2.0 4.3 MEDIUM AV:N/AC:M/Au:N/C:N/I:N/A:P

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.