High
Security advisory
The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-4408
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 05:40 UTC · Revision 1
Source evidence
The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.
osv:CVE-2023-4408
Complete source record
{
"id": "99c21eeb90280d405a65294b77e4a786a85607c479f61f2de40c1f1e0a9216b5",
"url": "https://osv.dev/vulnerability/CVE-2023-4408",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2023-4408",
"summary": "The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.",
"evidence": "osv:CVE-2023-4408",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2023-4408",
"aliases": [
"CVE-2023-4408"
],
"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": "19d6c56085e97cf4ac559cdc27edd624127bcb32"
},
{
"last_affected": "353fb4b9d32dba44574853568c749c6032a5554e"
},
{
"introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
},
{
"last_affected": "cb6cff65a928fd38bf29060d7810fa3be0aa091e"
},
{
"introduced": "cab15392afd841fe3b0bacd894003376d857459a"
},
{
"last_affected": "18a05caf55e019c7ddf491d7d78c51eebb993133"
},
{
"introduced": "1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"
},
{
"last_affected": "1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.0.0"
},
{
"last_affected": "9.16.45"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.18.0"
},
{
"last_affected": "9.18.21"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.19.0"
},
{
"last_affected": "9.19.19"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*",
"range": [
{
"introduced": "9.9.3-s1"
},
{
"last_affected": "9.9.3-s1"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"9.9.3-s1",
"v9.18.21",
"v9.19.19",
"v9.19.0",
"v9.18.0",
"v9.9.3b1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4408.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.isc.org/isc-projects/bind9",
"type": "GIT",
"events": [
{
"introduced": "19d6c56085e97cf4ac559cdc27edd624127bcb32"
},
{
"last_affected": "353fb4b9d32dba44574853568c749c6032a5554e"
},
{
"introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
},
{
"last_affected": "cb6cff65a928fd38bf29060d7810fa3be0aa091e"
},
{
"introduced": "cab15392afd841fe3b0bacd894003376d857459a"
},
{
"last_affected": "18a05caf55e019c7ddf491d7d78c51eebb993133"
},
{
"introduced": "1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"
},
{
"last_affected": "1c59cea1c0e26e2da3f2afb90200bfe9f7748c03"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.0.0"
},
{
"last_affected": "9.16.45"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.18.0"
},
{
"last_affected": "9.18.21"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.19.0"
},
{
"last_affected": "9.19.19"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*",
"range": [
{
"introduced": "9.9.3-s1"
},
{
"last_affected": "9.9.3-s1"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"9.9.3-s1",
"v9.18.21",
"v9.19.19",
"v9.19.0",
"v9.18.0",
"v9.9.3b1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4408.json"
}
}
],
"modified": "2026-10-24T10:30:32.074753732Z",
"provider": "osv",
"references": [
"https://kb.isc.org/docs/cve-2023-4408",
"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/",
"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/",
"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/",
"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/",
"https://security.netapp.com/advisory/ntap-20240426-0001/"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "38"
},
{
"last_affected": "38"
},
{
"introduced": "39"
},
{
"last_affected": "39"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:*",
"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:*:*:*",
"cpe:2.3:a:isc:bind:9.16.43:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.18.0:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.18.11:s1:*:*:supported_preview:*:*:*",
"cpe:2.3:a:isc:bind:9.18.18:s1:*:*:supported_preview:*:*:*"
],
"vendor_product": "isc:bind",
"extracted_events": [
{
"range": [
{
"introduced": "9.16.8-s1"
},
{
"last_affected": "9.16.8-s1"
},
{
"introduced": "9.16.8-s1"
},
{
"last_affected": "9.16.8-s1"
},
{
"introduced": "9.16.11-s1"
},
{
"last_affected": "9.16.11-s1"
},
{
"introduced": "9.16.11-s1"
},
{
"last_affected": "9.16.11-s1"
},
{
"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"
},
{
"introduced": "9.16.43-s1"
},
{
"last_affected": "9.16.43-s1"
},
{
"introduced": "9.16.43-s1"
},
{
"last_affected": "9.16.43-s1"
},
{
"introduced": "9.18.0-s1"
},
{
"last_affected": "9.18.0-s1"
},
{
"introduced": "9.18.0-s1"
},
{
"last_affected": "9.18.0-s1"
},
{
"introduced": "9.18.11-s1"
},
{
"last_affected": "9.18.11-s1"
},
{
"introduced": "9.18.11-s1"
},
{
"last_affected": "9.18.11-s1"
},
{
"introduced": "9.18.18-s1"
},
{
"last_affected": "9.18.18-s1"
},
{
"introduced": "9.18.18-s1"
},
{
"last_affected": "9.18.18-s1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:netapp:ontap:9.14.1:*:*:*:*:*:*:*",
"cpe:2.3:a:netapp:ontap:9.15.1:*:*:*:*:*:*:*"
],
"vendor_product": "netapp:ontap",
"extracted_events": [
{
"range": [
{
"introduced": "9.14.1"
},
{
"last_affected": "9.14.1"
},
{
"introduced": "9.15.1"
},
{
"last_affected": "9.15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2023-4408",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 432933,
"published_at": "2024-02-13T14:15:45.253+00:00"
}