Memory disclosure or crash via unchecked flowset bounds
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 heap data or crash the service. The process_netflow_v9_data_flowset() Data-template loop advances by an attacker-controlled record length without checking each read against packet_end. Any sender able to reach the unauthenticated NetFlow v9 UDP listener can trigger a service crash; disclosure requires access to affected flow outputs.
Summary
What happened
Out-of-bounds reads in FastNetMon Community Edition 1.2.9 and earlier allow remote attackers to disclose heap data or crash the service. The process_netflow_v9_data_flowset() Data-template loop advances by an attacker-controlled record length without checking each read against packet_end. Any sender able to reach the unauthenticated NetFlow v9 UDP listener can trigger a service crash; disclosure requires access to affected flow outputs.
The record
- CVE
- CVE-2026-48683
- 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
- May 26, 2026CVE publishedPublication date reported by the CVE source.
- May 26, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo