CVE-2025-1207Public exploit

Service crash via oversized DNS label

Published Feb 12, 2025 · Updated Feb 12, 2025

Denial of service in the DNS handler of Philippe Jounin Tftpd64 4.64 allows remote attackers to terminate the application via UDP. A DNS query containing a single 132-byte label passes invalid values to rep movsb, causing the process to terminate. The attack requires adjacent-network access to UDP port 53; DNS is enabled by default, and the crash interrupts the bundled services.

CVSS severity3.1
Low
EPSS probability0.32%
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 the DNS handler of Philippe Jounin Tftpd64 4.64 allows remote attackers to terminate the application via UDP. A DNS query containing a single 132-byte label passes invalid values to rep movsb, causing the process to terminate. The attack requires adjacent-network access to UDP port 53; DNS is enabled by default, and the crash interrupts the bundled services.

The record

CVE
CVE-2025-1207
Published
Feb 12, 2025
Updated
Feb 12, 2025
Vendor
Philippe Jounin
Product
Tftpd64
Classifications
CWE-404, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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?

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

  1. Affected versionversion=4.64

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Philippe Jounin · Tftpd64version=4.64

Published CVSS scores

1.8VulDBAV:A/AC:H/Au:N/C:N/I:N/A:P
2.3VulDBCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.1VulDBCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
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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