Isc · Bind 9 · CVE-2024-1975
**Name of the Vulnerable Software and Affected Versions**
BIND 9 versions 9.0.0 through 9.11.37
BIND 9 versions 9.16.0 through 9.16.50
BIND 9 versions 9.18.0 through 9.18.27
BIND 9 versions 9.19.0 through 9.19.24
BIND 9 versions 9.9.3-S1 through 9.11.37-S1
BIND 9 versions 9.16.8-S1 through 9.16.49-S1
BIND 9 versions 9.18.11-S1 through 9.18.27-S1
**Description**
A client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests if a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache.
**Recommendations**
For BIND 9 versions 9.0.0 through 9.11.37, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.16.0 through 9.16.50, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.18.0 through 9.18.27, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.19.0 through 9.19.24, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.9.3-S1 through 9.11.37-S1, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.16.8-S1 through 9.16.49-S1, update to a version outside of this range to resolve the issue.
For BIND 9 versions 9.18.11-S1 through 9.18.27-S1, update to a version outside of this range to resolve the issue.
As a temporary workaround, consider restricting the use of SIG(0) signed requests to minimize the risk of exploitation.