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.
CVE-2026-48687
“—” beside the score: it is equal to NVD's CVSS score.
Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-26. NVD baseline CVSS 9.8; sources differ by 0.0.
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8CRITICALmedium confidence
- EG Risk
- 45EG Risk 45/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity98% × 45%Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation2.6% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 2.7%
- EPSS %ILE
- 85th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 2.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
May 26, 2026
Last Modified
July 21, 2026
Advisory Details (3)
Auto-updated Oct 16, 2026CVE-2026-48687: OS Command Injection in FastNetMon Juniper Plugin Logging | Lorikeet Security
https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48687-juniper-cmd-injectionfastnetmon/src/juniper_plugin/fastnetmon_juniper.php at master · pavel-odintsov/fastnetmon · GitHub
https://github.com/pavel-odintsov/fastnetmon/blob/master/src/juniper_plugin/fastnetmon_juniper.phpGitHub - pavel-odintsov/fastnetmon: Very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support · GitHub
https://github.com/pavel-odintsov/fastnetmonVendor Advisories for CVE-2026-48687(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(3 across 3 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fastnetmon | 1.2.4-2 ... 1.2.9-1 (14 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fastnetmon | 1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-1 |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fastnetmon | 1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-1 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 20× in last 7d / 45× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 384 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 284 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-19 23:39 UTCEG score recompute
- 2026-10-19 23:39 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-18 22:09 UTCEG score recompute
- 2026-10-18 22:09 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-18 03:34 UTCEG score recompute
- 2026-10-17 20:37 UTCEG score recompute
- 2026-10-17 20:36 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-16 19:06 UTCEG score recompute
- 2026-10-16 19:05 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-15 16:18 UTCEG score recompute
- 2026-10-15 16:17 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-14 10:23 UTCEG score recompute
- 2026-10-14 10:22 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-13 08:53 UTCEG score recompute
- 2026-10-13 08:53 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-12 16:00 UTCEG score recompute
- 2026-10-12 07:23 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 moreShow fewer
- 2026-10-11 19:43 UTCEG score recompute
- 2026-10-11 16:58 UTCEG score recompute
- 2026-10-11 14:22 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-09-30 13:32 UTCOSV refresh
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-09-26 00:27 UTCEPSS rescoreEPSS 2.7% · 85th percentile
- 2026-09-23 17:53 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-11 20:23 UTCOSV refresh
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-24 00:31 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-23 20:27 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-23 16:26 UTCEG score recompute
- 2026-08-23 16:26 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-22 01:33 UTCEG score recompute
- 2026-08-22 01:33 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-21 21:32 UTCEG score recompute
- 2026-08-21 21:32 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-20 22:43 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-20 18:21 UTCEG score recompute
- 2026-08-20 18:21 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-17 13:41 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-17 09:36 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-16 16:44 UTCEG score recompute
- 2026-08-16 16:44 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-16 11:10 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-16 07:09 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-16 03:09 UTCEG score recompute
- 2026-08-16 03:09 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-15 02:17 UTCEG score recompute
- 2026-08-15 02:17 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-14 22:16 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 17:59 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 13:47 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 09:47 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 05:46 UTCGHSA enrichmentGHSA-qx97-6jw5-h44w · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-08-14 01:46 UTCEG score recompute
Related CVEs(same product + same CWE)
Same product
10 shownDebian:12:fastnetmon
Frequently asked(5)
What is CVE-2026-48687?
When was the CVE record for CVE-2026-48687 published?
Is CVE-2026-48687 actively exploited?
What is the CVSS score of CVE-2026-48687?
How do I remediate CVE-2026-48687?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48687
Is Your Infrastructure Affected by CVE-2026-48687?
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