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ISC BIND DoS Vulnerability (CVE-2021-25219)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
ISC BIND is prone to a denial of service (DoS) vulnerability.
Insight
Insight
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.
Affected Software
Affected Software
BIND 9.3.0 through 9.11.35, 9.12.0 through 9.16.21, 9.9.3-S1 through 9.11.35-S1, 9.16.8-S1 through 9.16.21-S1 and 9.17.0 through 9.17.18. Authoritative-only BIND 9 servers are not vulnerable to this flaw.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 9.11.36, 9.16.22, 9.17.19, 9.11.36-S1, 9.16.22-S1 or later.