Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP GTM, LTM
Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.6.0, 11.6.1, 11.6.2, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2
Fixed In:
13.0.0, 12.1.2 HF1, 11.6.3, 11.5.7
Opened: May 06, 2016 Severity: 3-Major
TMM crash when processing requests to a DNS virtual server.
Traffic disrupted while tmm restarts.
The issue can occur if a TCP DNS virtual receives a request when no pool members are available to service the request and a DNS iRule is suspended due to previous requests.
Mitigation is to ensure at least one pool member is available whenever the DNS virtual is processing traffic, or to avoid iRule commands that can suspend processing. Ensure datagram LB mode is enabled on UDP DNS virtuals.
Product corrected to prevent crash when there are no available members.