K77326807 : BIND vulnerability CVE-2021-25219

Security Advisory Description

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing. (CVE-2021-25219)

Impact

This vulnerability could be abused by an attacker to significantly degrade resolver performance.

BIG-IP

The BIG-IP system is affected only when the Use BIND Server on BIG-IP feature is enabled in the DNS profile. To verify, go toLocal Traffic>**Profiles **>Services, and select the affected DNS profile.