pavel-odintsov FastNetMon up to 1.2.9 NetFlow v9 Collector strlen interface-description out-of-bounds

Summaryinfo

A vulnerability classified as critical has been found in pavel-odintsov FastNetMon up to 1.2.9. This affects the function strlen of the component NetFlow v9 Collector. Performing a manipulation of the argument interface-description results in out-of-bounds. This vulnerability was named CVE-2026-92697. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in pavel-odintsov FastNetMon up to 1.2.9. This affects the function strlen of the component NetFlow v9 Collector. The manipulation of the argument interface-description with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-92697 since 09/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/05/2026).

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

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• pavel-odintsov

Name

• FastNetMon

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

Website

• Product: https://github.com/pavel-odintsov/fastnetmon/

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