Description
An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected products
- isc / bind9.18.36 – 9.18.49
- isc / BIND 99.18.36 – 9.18.48
- isc / BIND 99.20.8 – 9.20.22
- isc / BIND 99.21.7 – 9.21.21
- isc / BIND 99.18.36-S1 – 9.18.48-S1
- isc / BIND 99.20.9-S1 – 9.20.22-S1
Updated 38m ago · 8 sources