CVE-2024-56946Network attack vector

DoQ service interruption via uncaught listener exception

Published Feb 3, 2025 · Updated Mar 13, 2025

Denial of service in DNS-over-QUIC in Technitium DNS Server 13.2.2 and earlier allows remote attackers to halt new DoQ connections. AcceptQuicConnectionAsync lets an OperationCanceledException wrapped in QuicException escape its listener loop instead of continuing to accept connections. The unauthenticated attack requires network access to an enabled DNS-over-QUIC listener and interrupts that service without stopping the server process.

CVSS severity5.3
Medium
EPSS probability0.45%
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 DNS-over-QUIC in Technitium DNS Server 13.2.2 and earlier allows remote attackers to halt new DoQ connections. AcceptQuicConnectionAsync lets an OperationCanceledException wrapped in QuicException escape its listener loop instead of continuing to accept connections. The unauthenticated attack requires network access to an enabled DNS-over-QUIC listener and interrupts that service without stopping the server process.

The record

CVE
CVE-2024-56946
Published
Feb 3, 2025
Updated
Mar 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-248, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 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

5.3MITRECVSS:3.1/AC:L/AV:N/A:L/C:N/I:N/PR:N/S:U/UI: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.

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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

CWE-248Uncaught Exception
T1499Endpoint Denial of Service

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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