# CVE-2026-48694: fastnetmon: FastNetMon Community Edition through 1.2.9 contains a configuration injection vulnerability in the Juniper router int...

CVE-2026-48694 is fixed in fastnetmon on 1 platform, first by fastnetmon 1.2.8+git20250911-2ubuntu0.1~esm1, released May 26, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-48694
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 26, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fastnetmon Debian 13.5 (trixie) | 1.2.9-0+deb13u1 | [DEBIAN-CVE-2026-48694](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48694.md) | Jun 24, 2026 |
| Linux | fastnetmon Debian 14 | 1.2.9-1 | [DEBIAN-CVE-2026-48694](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48694.md) | Jun 24, 2026 |
| Linux | fastnetmon Ubuntu 20.04 LTS (focal) | 1.1.4-1ubuntu0.1~esm1 | [fastnetmon 1.1.4-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-fastnetmon-1.1.4-1ubuntu0.1-esm1.md) | Jun 24, 2026 |
| Linux | fastnetmon Ubuntu 24.04.5 LTS (noble) | 1.2.6-1ubuntu0.1~esm1 | [fastnetmon 1.2.6-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-fastnetmon-1.2.6-1ubuntu0.1-esm1.md) | Jun 24, 2026 |
| Linux | fastnetmon Ubuntu 26.04.1 LTS (resolute) | 1.2.8+git20250911-2ubuntu0.1~esm1 | [fastnetmon 1.2.8+git20250911-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-fastnetmon-1.2.8-git20250911-2ubuntu0.1-esm1.md) | May 26, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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