Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2022-3924
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:37 UTC · Revision 1
Source evidence
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.
osv:CVE-2022-3924
Complete source record
{
"id": "e59cd1fba6ed83d920586c1b07048c076d04077ef4f18e15c9ccad6775d1be08",
"url": "https://osv.dev/vulnerability/CVE-2022-3924",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2022-3924",
"summary": "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.",
"evidence": "osv:CVE-2022-3924",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2022-3924",
"aliases": [
"CVE-2022-3924"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/isc-projects/bind9",
"type": "GIT",
"events": [
{
"introduced": "aeb943df66f7db58fa7ff814a84fd25b8a6c8379"
},
{
"fixed": "2b2afb28abf4fb235ce0e9b1245cb673622c7dff"
},
{
"introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
},
{
"fixed": "1f554acee8df440c2fc211f976b196b31b9c9284"
},
{
"introduced": "cab15392afd841fe3b0bacd894003376d857459a"
},
{
"fixed": "a752887dce93b705a62b6f3769679c94fb43fbc7"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.16.12"
},
{
"fixed": "9.16.37"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.18.0"
},
{
"fixed": "9.18.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.19.0"
},
{
"fixed": "9.19.9"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v9.19.0",
"v9.18.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-3924.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.isc.org/isc-projects/bind9",
"type": "GIT",
"events": [
{
"introduced": "aeb943df66f7db58fa7ff814a84fd25b8a6c8379"
},
{
"fixed": "2b2afb28abf4fb235ce0e9b1245cb673622c7dff"
},
{
"introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
},
{
"fixed": "1f554acee8df440c2fc211f976b196b31b9c9284"
},
{
"introduced": "cab15392afd841fe3b0bacd894003376d857459a"
},
{
"fixed": "a752887dce93b705a62b6f3769679c94fb43fbc7"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.16.12"
},
{
"fixed": "9.16.37"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.18.0"
},
{
"fixed": "9.18.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.19.0"
},
{
"fixed": "9.19.9"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v9.19.0",
"v9.18.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-3924.json"
}
}
],
"modified": "2026-10-24T10:30:31.333200173Z",
"provider": "osv",
"references": [
"https://kb.isc.org/docs/cve-2022-3924"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:isc:bind:9.16.12:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.16.14:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.16.21:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.16.32:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.16.36:s1:*:*:supported_preview:*:*:*"
],
"vendor_product": "isc:bind",
"extracted_events": [
{
"range": [
{
"introduced": "9.16.12-s1"
},
{
"last_affected": "9.16.12-s1"
},
{
"introduced": "9.16.12-s1"
},
{
"last_affected": "9.16.12-s1"
},
{
"introduced": "9.16.13-s1"
},
{
"last_affected": "9.16.13-s1"
},
{
"introduced": "9.16.13-s1"
},
{
"last_affected": "9.16.13-s1"
},
{
"introduced": "9.16.14-s1"
},
{
"last_affected": "9.16.14-s1"
},
{
"introduced": "9.16.14-s1"
},
{
"last_affected": "9.16.14-s1"
},
{
"introduced": "9.16.21-s1"
},
{
"last_affected": "9.16.21-s1"
},
{
"introduced": "9.16.21-s1"
},
{
"last_affected": "9.16.21-s1"
},
{
"introduced": "9.16.32-s1"
},
{
"last_affected": "9.16.32-s1"
},
{
"introduced": "9.16.32-s1"
},
{
"last_affected": "9.16.32-s1"
},
{
"introduced": "9.16.36-s1"
},
{
"last_affected": "9.16.36-s1"
},
{
"introduced": "9.16.36-s1"
},
{
"last_affected": "9.16.36-s1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2022-3924",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 432774,
"published_at": "2023-01-26T21:16:03.273+00:00"
}