FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability in the Juniper router integration plugin. The _log() function in src/juniper_plugin/fastnetmon_juniper.php (lines 117-118) constructs shell commands by concatenating the $msg parameter directly into exec() calls: exec("echo `date` \"- {FASTNETMON] - " . $msg . " \" >> " . $FILE_LOG_TMP). The $msg variable contains unsanitized data derived from command-line arguments argv[1] through argv[3], which represent the attack IP address, direction, and power. While FastNetMon's C++ core currently passes IP addresses via inet_ntoa() (which only produces safe dotted-decimal notation), the PHP script performs no input validation or shell escaping. If the script is invoked directly, by another orchestration system, or if future code changes pass string-sourced IPs, arbitrary commands can be injected. The correct fix is to replace exec() with file_put_contents() or use escapeshellarg() on all parameters.
History

Wed, 27 May 2026 23:15:00 +0000

Type Values Removed Values Added
Title OS Command Injection in FastNetMon Juniper Plugin

Wed, 27 May 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


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

Type Values Removed Values Added
CPEs cpe:2.3:a:pavel-odintsov:fastnetmon:*:*:*:*:community:*:*:*
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


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

Type Values Removed Values Added
Title OS Command Injection in FastNetMon Juniper Plugin
First Time appeared Pavel-odintsov
Pavel-odintsov fastnetmon
Weaknesses CWE-78
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 OS command injection vulnerability in the Juniper router integration plugin. The _log() function in src/juniper_plugin/fastnetmon_juniper.php (lines 117-118) constructs shell commands by concatenating the $msg parameter directly into exec() calls: exec("echo `date` \"- {FASTNETMON] - " . $msg . " \" >> " . $FILE_LOG_TMP). The $msg variable contains unsanitized data derived from command-line arguments argv[1] through argv[3], which represent the attack IP address, direction, and power. While FastNetMon's C++ core currently passes IP addresses via inet_ntoa() (which only produces safe dotted-decimal notation), the PHP script performs no input validation or shell escaping. If the script is invoked directly, by another orchestration system, or if future code changes pass string-sourced IPs, arbitrary commands can be injected. The correct fix is to replace exec() with file_put_contents() or use escapeshellarg() on all parameters.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-05-26T00:00:00.000Z

Updated: 2026-05-27T17:23:49.636Z

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

Link: CVE-2026-48687

cve-icon Vulnrichment

Updated: 2026-05-27T17:23:41.018Z

cve-icon NVD

Status : Modified

Published: 2026-05-26T16:16:26.800

Modified: 2026-05-27T18:16:28.007

Link: CVE-2026-48687

cve-icon Redhat

No data.