---
id: CVE-2026-92697
title: >-
  FastNetMon: NetFlow v9 unbounded strlen() on interface-description field
  causes remote out-of-bounds read
summary: "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 le…"
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: pavel-odintsov
product: fastnetmon
affected:
  - fastnetmon <= 1.2.9
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T22:34:52.385Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92697'
references:
  - url: >-
      https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-ff5f-p5jw-8fq2
    label: >-
      https://github.com/pavel-odintsov/fastnetmon/security/advisories/GHSA-ff5f-p5jw-8fq2
  - url: 'https://github.com/pavel-odintsov/fastnetmon/pull/1088'
    label: 'https://github.com/pavel-odintsov/fastnetmon/pull/1088'
  - url: >-
      https://github.com/pavel-odintsov/fastnetmon/commit/9dc766074dc3048ec5007bc3f6a44f2b42d1e1cb
    label: >-
      https://github.com/pavel-odintsov/fastnetmon/commit/9dc766074dc3048ec5007bc3f6a44f2b42d1e1cb
tags:
  - cve.org
ingestedAt: '2026-11-05T23:41:31.941Z'
epss: 0.01138
epssPercentile: 0.66783
---

## Overview

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.

## Affected

- `fastnetmon <= 1.2.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.