CVE-2023-5679Network attack vector

Remote named crash via DNS64 serve-stale interaction

Published Feb 13, 2024 · Updated Mar 28, 2025

Denial of service in affected ISC BIND 9 releases allows remote attackers to crash named by querying a DNS64 resolver for stale data. ISC has not published the specific resolver state transition or assertion locus responsible for the DNS64 and serve-stale interaction. The unauthenticated network path is reachable only when both DNS64 and serve-stale are enabled, and exploitation terminates the DNS server process.

CVSS severity7.5
High
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in affected ISC BIND 9 releases allows remote attackers to crash named by querying a DNS64 resolver for stale data. ISC has not published the specific resolver state transition or assertion locus responsible for the DNS64 and serve-stale interaction. The unauthenticated network path is reachable only when both DNS64 and serve-stale are enabled, and exploitation terminates the DNS server process.

The record

CVE
CVE-2023-5679
Published
Feb 13, 2024
Updated
Mar 28, 2025
Vendor
Internet Systems Consortium
Product
BIND 9
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.16.12 <=9.16.45
  2. Affected versionversion=9.16.12-S1 <=9.16.45-S1
  3. Affected versionversion=9.18.0 <=9.18.21
  4. Affected versionversion=9.18.11-S1 <=9.18.21-S1
  5. Affected versionversion=9.19.0 <=9.19.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Internet Systems Consortium · BIND 9version=9.16.12 <=9.16.45; version=9.16.12-S1 <=9.16.45-S1; version=9.18.0 <=9.18.21; version=9.18.11-S1 <=9.18.21-S1; version=9.19.0 <=9.19.19

Published CVSS scores

7.5Internet Systems ConsortiumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo