CVE-2026-48684Network attack vector

Memory disclosure or crash via unchecked lengths

Published May 26, 2026 · Updated May 26, 2026

Out-of-bounds reads in FastNetMon Community Edition 1.2.9 and earlier allow remote attackers to disclose process memory or crash the service. The scope and options loops in process_netflow_v9_options_template() trust UDP-supplied length fields and dereference four-byte records without checking the flowset boundary. A single unauthenticated options-template packet can reach the NetFlow v9 listener on its default UDP port 2055.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in FastNetMon Community Edition 1.2.9 and earlier allow remote attackers to disclose process memory or crash the service. The scope and options loops in process_netflow_v9_options_template() trust UDP-supplied length fields and dereference four-byte records without checking the flowset boundary. A single unauthenticated options-template packet can reach the NetFlow v9 listener on its default UDP port 2055.

The record

CVE
CVE-2026-48684
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record 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

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application 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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