Vulnerability Details CVE-2022-3924
This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero.
If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure.
This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 68.2%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2022-3924
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cpe:2.3:a:isc:bind:9.16.12
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cpe:2.3:a:isc:bind:9.16.13
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cpe:2.3:a:isc:bind:9.16.14
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cpe:2.3:a:isc:bind:9.16.15
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cpe:2.3:a:isc:bind:9.16.19
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cpe:2.3:a:isc:bind:9.16.21
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cpe:2.3:a:isc:bind:9.16.22
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cpe:2.3:a:isc:bind:9.16.32
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cpe:2.3:a:isc:bind:9.16.36
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cpe:2.3:a:isc:bind:9.18.0
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cpe:2.3:a:isc:bind:9.18.1
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cpe:2.3:a:isc:bind:9.18.10
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cpe:2.3:a:isc:bind:9.18.2
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cpe:2.3:a:isc:bind:9.18.3
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cpe:2.3:a:isc:bind:9.18.4
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cpe:2.3:a:isc:bind:9.18.5
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cpe:2.3:a:isc:bind:9.18.6
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cpe:2.3:a:isc:bind:9.18.7
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cpe:2.3:a:isc:bind:9.18.8
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cpe:2.3:a:isc:bind:9.19.0
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cpe:2.3:a:isc:bind:9.19.1
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cpe:2.3:a:isc:bind:9.19.2
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cpe:2.3:a:isc:bind:9.19.3
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cpe:2.3:a:isc:bind:9.19.4
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cpe:2.3:a:isc:bind:9.19.5
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cpe:2.3:a:isc:bind:9.19.6
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cpe:2.3:a:isc:bind:9.19.8