No exploitation reported

CVE-2023-4408

No exploitation reported by the sources we read.

Published2024-02-13
WeaknessCWE-407

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2024-02-1314:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-4408?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-4408?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Isc bind

Branch	Affected	Fixed in	Source
9.x	≥ 9.0.0, ≤ 9.16.45	no fix published	NVD
9.18	≥ 9.18.0, ≤ 9.18.21	no fix published	NVD
9.19	≥ 9.19.0, ≤ 9.19.19	no fix published	NVD
9.9	= 9.9.3	no fix published	NVD
9.16	= 9.16.8	no fix published	NVD
9.16	= 9.16.11	no fix published	NVD
9.16	= 9.16.12	no fix published	NVD
9.16	= 9.16.13	no fix published	NVD
9.16	= 9.16.14	no fix published	NVD
9.16	= 9.16.21	no fix published	NVD
9.16	= 9.16.32	no fix published	NVD
9.16	= 9.16.36	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
38.x	= 38	no fix published	NVD
39.x	= 39	no fix published	NVD

Netapp ontap

Branch	Affected	Fixed in	Source
9.14	= 9.14.1	no fix published	NVD
9.15	= 9.15.1	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

bindAlmaLinux:9all versions · fixed in 32:9.16.23-14.el9_3.4and 9 other packages
bindAlmaLinux:9all versions · fixed in 32:9.16.23-18.el9_4.1and 9 other packages
bindAlmaLinux:8all versions · fixed in 32:9.11.36-11.el8_9.1and 16 other packages
bindAlmaLinux:8all versions · fixed in 32:9.11.36-14.el8_10and 16 other packages
bind-dyndb-ldapAlmaLinux:9all versions · fixed in 11.9-8.el9_3.3.alma.1
bind-dyndb-ldapAlmaLinux:9all versions · fixed in 11.9-9.el9_4.alma.1
bind9.16AlmaLinux:8all versions · fixed in 32:9.16.23-0.16.el8_9.2.alma.1and 8 other packages

Full record on NVD

Fix

Advisories and patches

kb.isc.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2024-02-21
OpenCVESSVC decisionnone—
CNACVSS 3.17.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-4072024-05-23
FIRST EPSSEPSS score1.4 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2024-02-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-4408?

Is CVE-2023-4408 actively exploited?

Active exploitation of CVE-2023-4408 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-4408?

CVE-2023-4408 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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