CVE-2023-30464Network attack vector

Cache poisoning via unaggregated concurrent DNS queries

Published Sep 18, 2024 · Updated Sep 19, 2024

DNS cache poisoning in CoreDNS 1.10.1 and earlier allows remote attackers to inject forged DNS responses via a birthday attack. CoreDNS permits multiple simultaneous upstream queries for the same name instead of aggregating them, increasing the chance that a forged reply matches a transaction ID. Exploitation requires network access for queries and spoofed replies; a successful collision stores attacker-controlled DNS data for subsequent clients.

CVSS severity7.5
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS cache poisoning in CoreDNS 1.10.1 and earlier allows remote attackers to inject forged DNS responses via a birthday attack. CoreDNS permits multiple simultaneous upstream queries for the same name instead of aggregating them, increasing the chance that a forged reply matches a transaction ID. Exploitation requires network access for queries and spoofed replies; a successful collision stores attacker-controlled DNS data for subsequent clients.

The record

CVE
CVE-2023-30464
Published
Sep 18, 2024
Updated
Sep 19, 2024
Vendor
CoreDNS
Product
CoreDNS
Classifications
CWE-290, CAPEC-142, T1565.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=1.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CoreDNS · CoreDNSversion=0 <=1.10.1

Published CVSS scores

3.7GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
6.3GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CAPEC-142DNS Cache Poisoning
T1565.002Transmitted Data Manipulation

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

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Your stack

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