FastNetMon Community Edition up to 1.2.9 NetFlow v9 Data Flowset Processor netflow_v9_collector.cpp out-of-bounds

Summaryinfo

A vulnerability classified as problematic was found in FastNetMon Community Edition up to 1.2.9. This issue affects some unknown processing of the file src/netflow_plugin/netflow_v9_collector.cpp of the component NetFlow v9 Data Flowset Processor. Such manipulation leads to out-of-bounds. This vulnerability is documented as CVE-2026-48683. There is not any exploit available.

Detailsinfo

A vulnerability was found in FastNetMon Community Edition up to 1.2.9 and classified as problematic. Affected by this issue is an unknown function of the file src/netflow_plugin/netflow_v9_collector.cpp of the component NetFlow v9 Data Flowset Processor. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. CVE summarizes:

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read vulnerability in the NetFlow v9 data flowset processor. In src/netflow_plugin/netflow_v9_collector.cpp, the Data template branch (lines 1695-1702) iterates over flow records without performing a per-iteration bounds check against the packet end pointer. In contrast, the Options template branch (lines 1709-1719) correctly checks 'if (pkt + offset + field_template->total_length > packet_end)' before each iteration. The Data branch omits this check entirely. Since template definitions are sent by the network peer (and are unauthenticated UDP), an attacker can craft templates that cause the parser to read arbitrary memory past the packet buffer. This can leak sensitive memory contents or cause a crash.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-48683 since 05/22/2026. The exploitation is known to be easy. Technical details are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• FastNetMon

Name

• Community Edition

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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• 🔒
• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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