CVE-2026-48687

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-26. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
75%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

CVE-2026-48687: OS Command Injection in FastNetMon Juniper Plugin Logging | Lorikeet Security

https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48687-juniper-cmd-injection
generic

fastnetmon/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.php
generic

GitHub - pavel-odintsov/fastnetmon: Very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support · GitHub

https://github.com/pavel-odintsov/fastnetmon

Vendor 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)
PackageVulnerable rangeFixed inDependents
fastnetmon1.2.4-2 ... 1.2.9-1 (14 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
fastnetmon1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-11.2.9-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
fastnetmon1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-11.2.9-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 98× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 330 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-09-01 04:40 UTCEPSS rescore
  5. 2026-08-30 19:17 UTCEPSS rescore
  6. 2026-08-30 01:22 UTCEPSS rescore
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-27 14:25 UTCEPSS rescore
  9. 2026-08-26 14:46 UTCEPSS rescore
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-24 00:31 UTCGHSA enrichment
  12. 2026-08-23 20:27 UTCGHSA enrichment
  13. 2026-08-23 16:26 UTCEG score recompute
  14. 2026-08-23 16:26 UTCGHSA enrichment
  15. 2026-08-23 00:19 UTCEPSS rescore
  16. 2026-08-22 01:33 UTCEG score recompute
  17. 2026-08-22 01:33 UTCGHSA enrichment
  18. 2026-08-21 23:49 UTCEPSS rescore
  19. 2026-08-21 21:32 UTCEG score recompute
  20. 2026-08-21 21:32 UTCGHSA enrichment
  21. 2026-08-20 22:55 UTCEPSS rescore
  22. 2026-08-20 22:43 UTCGHSA enrichment
  23. 2026-08-20 18:21 UTCEG score recompute
  24. 2026-08-20 18:21 UTCGHSA enrichment
  25. 2026-08-19 17:04 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-17 13:41 UTCGHSA enrichment
  4. 2026-08-17 09:36 UTCGHSA enrichment
  5. 2026-08-16 16:44 UTCEG score recompute
  6. 2026-08-16 16:44 UTCGHSA enrichment
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-16 11:10 UTCGHSA enrichment
  9. 2026-08-16 07:09 UTCGHSA enrichment
  10. 2026-08-16 03:09 UTCEG score recompute
  11. 2026-08-16 03:09 UTCGHSA enrichment
  12. 2026-08-16 02:14 UTCEPSS rescore
  13. 2026-08-15 02:17 UTCEG score recompute
  14. 2026-08-15 02:17 UTCGHSA enrichment
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-14 22:16 UTCGHSA enrichment
  17. 2026-08-14 17:59 UTCGHSA enrichment
  18. 2026-08-14 13:47 UTCGHSA enrichment
  19. 2026-08-14 09:47 UTCGHSA enrichment
  20. 2026-08-14 05:46 UTCGHSA enrichment
  21. 2026-08-14 01:46 UTCEG score recompute
  22. 2026-08-14 01:46 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 10:42 UTCGHSA enrichment
  25. 2026-08-13 06:29 UTCGHSA enrichment
  26. 2026-08-13 02:26 UTCGHSA enrichment
  27. 2026-08-12 22:25 UTCGHSA enrichment
  28. 2026-08-12 18:25 UTCGHSA enrichment
  29. 2026-08-12 14:10 UTCEG score recompute
  30. 2026-08-12 14:10 UTCGHSA enrichment
  31. 2026-08-12 13:51 UTCEPSS rescore
  32. 2026-08-12 09:46 UTCGHSA enrichment
  33. 2026-08-12 02:37 UTCGHSA enrichment
  34. 2026-08-11 22:35 UTCGHSA enrichment
  35. 2026-08-11 18:34 UTCEG score recompute
  36. 2026-08-11 18:34 UTCGHSA enrichment
  37. 2026-08-11 13:43 UTCGHSA enrichment
  38. 2026-08-11 08:25 UTCGHSA enrichment
  39. 2026-08-11 04:24 UTCGHSA enrichment
  40. 2026-08-11 00:24 UTCEG score recompute
  41. 2026-08-11 00:24 UTCGHSA enrichment
  42. 2026-08-11 00:00 UTCEPSS rescore
  43. 2026-08-10 12:38 UTCGHSA enrichment
  44. 2026-08-10 08:32 UTCGHSA enrichment
  45. 2026-08-10 04:32 UTCGHSA enrichment
  46. 2026-08-10 00:31 UTCGHSA enrichment
  47. 2026-08-09 20:31 UTCGHSA enrichment
  48. 2026-08-09 16:30 UTCEG score recompute
  49. 2026-08-09 16:30 UTCGHSA enrichment
  50. 2026-08-09 13:46 UTCEPSS rescore
  51. 2026-08-09 12:30 UTCGHSA enrichment
  52. 2026-08-09 08:12 UTCGHSA enrichment
  53. 2026-08-09 04:12 UTCGHSA enrichment
  54. 2026-08-09 00:11 UTCEG score recompute
  55. 2026-08-09 00:11 UTCGHSA enrichment
  56. 2026-08-08 16:37 UTCEPSS rescore
  57. 2026-08-08 13:18 UTCGHSA enrichment
  58. 2026-08-08 09:17 UTCGHSA enrichment
  59. 2026-08-08 05:16 UTCGHSA enrichment
  60. 2026-08-08 01:16 UTCGHSA enrichment
  61. 2026-08-07 21:15 UTCGHSA enrichment
  62. 2026-08-07 17:15 UTCEG score recompute
  63. 2026-08-07 17:15 UTCGHSA enrichment
  64. 2026-08-07 13:14 UTCGHSA enrichment
  65. 2026-08-07 09:12 UTCGHSA enrichment
  66. 2026-08-07 05:11 UTCGHSA enrichment
  67. 2026-08-07 01:10 UTCGHSA enrichment
  68. 2026-08-06 21:09 UTCGHSA enrichment
  69. 2026-08-06 17:09 UTCEG score recompute
  70. 2026-08-06 17:09 UTCGHSA enrichment
  71. 2026-08-06 13:47 UTCEPSS rescore
  72. 2026-08-06 13:09 UTCGHSA enrichment
  73. 2026-08-06 09:07 UTCGHSA enrichment
  74. 2026-08-06 05:06 UTCGHSA enrichment
  75. 2026-08-06 01:06 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48687?
CVE-2026-48687 is a critical vulnerability published on May 26, 2026. FastNetMon Community Edition through 1.2.9 contains an OS command injection vulnerability in the Juniper router integration plugin. The log() function in src/juniperplugin/fastnetmonjuniper.php (lines 117-118) constructs shell commands by concatenating the $msg parameter directly into exec() calls:…
When was CVE-2026-48687 disclosed?
CVE-2026-48687 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48687 actively exploited?
CVE-2026-48687 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 25.2% of all scored CVEs.
What is the CVSS score of CVE-2026-48687?
CVE-2026-48687 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-48687?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48687, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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