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CVE-2026-20237

CRITICAL(9.1)

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Risk Signal Score33/100 — MITTEL
  • CVSS 9.1 — Kritisch
  • Weniger als 24 Stunden alt

Erwähnungen (letzte 60 Tage)

Artikel

Beschreibung

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC), engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20237 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

Erkennung & Indikatoren

Ausnutzung

One of the internally discovered vulnerabilities is known to be actively exploited.

Threat-Hunting-Queries

Sentinel/Defender KQL

DeviceProcessEvents
| where InitiatingProcessFileName in ("java", "python", "perl", "php", "ruby", "node")
| where ProcessCommandLine contains "input" or ProcessCommandLine contains "validation"
| where FolderPath contains "Cisco Identity Services Engine" or FolderPath contains "Cisco ISE Passive Identity Connector"
| project TimeGenerated, DeviceName, InitiatingProcessFileName, ProcessCommandLine, FolderPath, FileName

Splunk SPL

index=your_index_name sourcetype=your_sourcetype_name (process="java" OR process="python" OR process="perl" OR process="php" OR process="ruby" OR process="node") (command_line=*input* OR command_line=*validation*) (path=*Cisco Identity Services Engine* OR path=*Cisco ISE Passive Identity Connector*)
| table _time, host, process, command_line, path, file_name

Sigma

title: Cisco ISE Improper Input Validation
id: 9a1b2c3d-4e5f-6789-abcd-ef0123456789
status: experimental
description: Detects potential exploitation attempts related to improper input validation in Cisco ISE.
author: SecBoard
date: 2026/09/16
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    ParentImage|endswith:
      - '\java.exe'
      - '\python.exe'
      - '\perl.exe'
      - '\php.exe'
      - '\ruby.exe'
      - '\node.exe'
    CommandLine|contains:
      - 'input'
      - 'validation'
    Image|contains:
      - 'Cisco Identity Services Engine'
      - 'Cisco ISE Passive Identity Connector'
  condition: selection
fields:
  - CommandLine
  - ParentImage
  - Image
tags:
  - attack.initial_access
  - cve.2026.20237

Elastic ES|QL

from process where process.parent.executable in ("java", "python", "perl", "php", "ruby", "node") and (process.args contains "input" or process.args contains "validation") and (process.executable contains "Cisco Identity Services Engine" or process.executable contains "Cisco ISE Passive Identity Connector")

SecBoard-generated · behavioral · requires customization — Von SecBoard erzeugt und nicht in einer Zielumgebung validiert. Vor dem Einsatz an die eigene Protokollierung anpassen.

Referenzen