Description
FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template parser. In process_netflow_v9_options_template() (src/netflow_plugin/netflow_v9_collector.cpp), the scope parsing loop (lines 224-229) iterates until scopes_offset reaches the attacker-controlled option_scope_length value, reading netflow9_template_flowset_record_t structures at each step. No bounds check validates that (zone_address + scopes_offset + sizeof(record)) stays within the flowset. The same issue affects the options field loop (lines 241-257) with option_length. Furthermore, option_scope_length is not validated to be a multiple of sizeof(netflow9_template_flowset_record_t), potentially causing misaligned reads. An attacker can trigger reads past the end of the UDP packet buffer.
Published: 2026-05-26
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 27 May 2026 14:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:pavel-odintsov:fastnetmon:*:*:*:*:community:*:*:*

Tue, 26 May 2026 23:30:00 +0000

Type Values Removed Values Added
Title FastNetMon NetFlow v9 Options Out-Of-Bounds Read

Tue, 26 May 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 26 May 2026 16:45:00 +0000

Type Values Removed Values Added
Title FastNetMon NetFlow v9 Options Out-Of-Bounds Read
First Time appeared Pavel-odintsov
Pavel-odintsov fastnetmon
Weaknesses CWE-125
Vendors & Products Pavel-odintsov
Pavel-odintsov fastnetmon

Tue, 26 May 2026 15:45:00 +0000

Type Values Removed Values Added
Description FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the NetFlow v9 options template parser. In process_netflow_v9_options_template() (src/netflow_plugin/netflow_v9_collector.cpp), the scope parsing loop (lines 224-229) iterates until scopes_offset reaches the attacker-controlled option_scope_length value, reading netflow9_template_flowset_record_t structures at each step. No bounds check validates that (zone_address + scopes_offset + sizeof(record)) stays within the flowset. The same issue affects the options field loop (lines 241-257) with option_length. Furthermore, option_scope_length is not validated to be a multiple of sizeof(netflow9_template_flowset_record_t), potentially causing misaligned reads. An attacker can trigger reads past the end of the UDP packet buffer.
References

Subscriptions

Pavel-odintsov Fastnetmon
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-26T20:58:11.200Z

Reserved: 2026-05-22T00:00:00.000Z

Link: CVE-2026-48684

cve-icon Vulnrichment

Updated: 2026-05-26T20:58:01.574Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-26T16:16:26.440

Modified: 2026-06-17T10:55:10.153

Link: CVE-2026-48684

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-26T23:15:20Z

Weaknesses