OS Command Injection Affecting fastnetmon package, versions <1.2.9-0+deb13u1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
1.07% (65th percentile)

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  • Snyk IDSNYK-DEBIAN13-FASTNETMON-17089142
  • published29 May 2026
  • disclosed26 May 2026

Introduced: 26 May 2026

CVE-2026-48695  (opens in a new tab)
CWE-78  (opens in a new tab)

How to fix?

Upgrade Debian:13 fastnetmon to version 1.2.9-0+deb13u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fastnetmon package and not the fastnetmon package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability in the MikroTik router integration plugin. The _log() function in src/mikrotik_plugin/fastnetmon_mikrotik.php (lines 107-108) constructs shell commands by concatenating the $msg parameter directly into exec() calls: exec("echo date &#34;- {FASTNETMON] - " . $msg . " &#34; >> " . $FILE_LOG_TMP). This is identical in pattern to the Juniper plugin vulnerability. The $msg variable contains unsanitized attack data from command-line arguments. An attacker who can influence argv[] values can inject arbitrary shell commands. The fix is to replace exec() with file_put_contents() or use escapeshellarg().

CVSS Base Scores

version 3.1