FastNetMon Community Edition up to 1.2.9 fastnetmon_juniper.php IP_ATTACK injection

Summaryinfo

A vulnerability classified as critical has been found in FastNetMon Community Edition up to 1.2.9. Affected is an unknown function of the file src/juniper_plugin/fastnetmon_juniper.php. This manipulation of the argument IP_ATTACK causes injection. The identification of this vulnerability is CVE-2026-48694. There is no exploit available.

Detailsinfo

A vulnerability was found in FastNetMon Community Edition up to 1.2.9. It has been declared as critical. Affected by this vulnerability is some unknown processing of the file src/juniper_plugin/fastnetmon_juniper.php. The manipulation of the argument IP_ATTACK with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

FastNetMon Community Edition through 1.2.9 contains a configuration injection vulnerability in the Juniper router integration plugin. In src/juniper_plugin/fastnetmon_juniper.php, the $IP_ATTACK variable (received from argv[1]) is directly interpolated into Juniper NETCONF set-configuration commands at lines 69 and 90 without any validation or sanitization. Line 69: $conn->load_set_configuration("set routing-options static route {$IP_ATTACK} community 65535:666 discard"). Line 90: $conn->load_set_configuration("delete routing-options static route {$IP_ATTACK}/32"). An attacker who can control the IP address string can inject additional Juniper CLI configuration commands by embedding newline characters followed by arbitrary set/delete commands. This could modify the router's routing table, firewall filters, user accounts, or any other configuration element accessible via NETCONF. The impact is full router compromise.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-48694 since 05/22/2026. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/19/2026). MITRE ATT&CK project uses the attack technique T1055 for this issue.

By approaching the search of inurl:src/juniper_plugin/fastnetmon_juniper.php it is possible to find vulnerable targets with Google Hacking. The vulnerability scanner Nessus provides a plugin with the ID 321184 (Ubuntu 20.04 LTS / 24.04 LTS / 26.04 LTS : FastNetMon vulnerabilities (USN-8429-1)), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the vulnerability database at Tenable (321184). If you want to get the best quality for vulnerability data then you always have to consider 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

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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