CVE-2024-56073Network attack vector

Remote service crash via zero-length NetFlow template

Published Dec 15, 2024 · Updated Dec 16, 2024

Divide-by-zero in FastNetMon Community Edition 1.2.7 and earlier allows remote attackers to crash the service via NetFlow v9 packets. The NetFlow v9 collector accepts data or options templates with a zero aggregate field length, stores them, and later divides a flowset length by that value. Any unauthenticated sender able to reach the NetFlow listener can interrupt traffic monitoring by terminating the FastNetMon process.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in FastNetMon Community Edition 1.2.7 and earlier allows remote attackers to crash the service via NetFlow v9 packets. The NetFlow v9 collector accepts data or options templates with a zero aggregate field length, stores them, and later divides a flowset length by that value. Any unauthenticated sender able to reach the NetFlow listener can interrupt traffic monitoring by terminating the FastNetMon process.

The record

CVE
CVE-2024-56073
Published
Dec 15, 2024
Updated
Dec 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-369, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 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?

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

7.5CISA-ADPCVSS: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.

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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-369Divide By Zero
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

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Your stack

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