CVE-2023-28452Public exploitNetwork attack vector

DNS resolution interruption via malformed UDP responses

Published Sep 18, 2024 · Updated Mar 19, 2025

Denial of service in CoreDNS before 1.11.0 allows remote attackers to interrupt DNS resolution by forging a UDP response to a resolver source port. In plugin/pkg/proxy/connect.go, Proxy.Connect formerly treated any UDP ReadMsg parsing error as terminal, closed the upstream connection, and stopped waiting for a valid response. Exploitation requires a forged malformed response to reach the resolver's active source port, but the transaction ID need not be guessed; successful attacks make ordinary lookups time out.

CVSS severity8.2
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in CoreDNS before 1.11.0 allows remote attackers to interrupt DNS resolution by forging a UDP response to a resolver source port. In plugin/pkg/proxy/connect.go, Proxy.Connect formerly treated any UDP ReadMsg parsing error as terminal, closed the upstream connection, and stopped waiting for a valid response. Exploitation requires a forged malformed response to reach the resolver's active source port, but the transaction ID need not be guessed; successful attacks make ordinary lookups time out.

The record

CVE
CVE-2023-28452
Published
Sep 18, 2024
Updated
Mar 19, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-290, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.9GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 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 exploitPublished

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1499.004Application or System Exploitation

Public exploit references

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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