CVE-2026-48687
FastNetMon Community Edition through 1.2.9 contains an OS command inje ...
Severity by source
Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Ubuntu (medium).
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.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| debian 12 | fastnetmon | no fix listed |
| debian 13 | fastnetmon | 1.2.9-0+deb13u1 |
| debian 14 | fastnetmon | 1.2.9-1 |
| echo | fastnetmon | 1.2.9-0+deb13u1 |
| rapidfort debian 12 | fastnetmon | 0:1.2.9-0+deb13u1, 0:1.2.9-1 |
| rapidfort debian 13 | fastnetmon | 0:1.2.9-0+deb13u1, 0:1.2.9-1 |
| rapidfort fedora 43 | fastnetmon | 1.2.9-2.fc43 |
| rapidfort Oracle Linux 10 | fastnetmon | no fix listed |
| rapidfort Oracle Linux 9 | fastnetmon | no fix listed |
| rapidfort ubuntu 20.04 | fastnetmon | no fix listed |
| rapidfort ubuntu 22.04 | fastnetmon | no fix listed |
| rapidfort ubuntu 24.04 | fastnetmon | no fix listed |
Show all 15 entries from 15 sources
| Source | Package | Fixed in |
|---|---|---|
| debian 12 | fastnetmon | no fix listed |
| debian 13 | fastnetmon | 1.2.9-0+deb13u1 |
| debian 14 | fastnetmon | 1.2.9-1 |
| echo | fastnetmon | 1.2.9-0+deb13u1 |
| rapidfort debian 12 | fastnetmon | 0:1.2.9-0+deb13u1, 0:1.2.9-1 |
| rapidfort debian 13 | fastnetmon | 0:1.2.9-0+deb13u1, 0:1.2.9-1 |
| rapidfort fedora 43 | fastnetmon | 1.2.9-2.fc43 |
| rapidfort Oracle Linux 10 | fastnetmon | no fix listed |
| rapidfort Oracle Linux 9 | fastnetmon | no fix listed |
| rapidfort ubuntu 20.04 | fastnetmon | no fix listed |
| rapidfort ubuntu 22.04 | fastnetmon | no fix listed |
| rapidfort ubuntu 24.04 | fastnetmon | no fix listed |
| ubuntu 20.04-ESM | fastnetmon | 1.1.4-1ubuntu0.1~esm1 |
| ubuntu 24.04 | fastnetmon | no fix listed |
| ubuntu 26.04 | fastnetmon | no fix listed |
References
- https://github.com/pavel-odintsov/fastnetmon
- https://github.com/pavel-odintsov/fastnetmon/blob/master/src/juniper_plugin/fastnetmon_juniper.php
- https://github.com/pavel-odintsov/fastnetmon/commit/6f58184fb60248df011c4c379bf445e07609ad27
- https://github.com/pavel-odintsov/fastnetmon/pull/1049
- https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48687-juniper-cmd-injection
- https://ubuntu.com/security/notices/USN-8429-1
- https://www.cve.org/CVERecord?id=CVE-2026-48687