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CVE-2026-76499

CRITICAL(9.8)

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

Risk Signal Score25/100 — MITTEL
  • CVSS 9.8 — Kritisch

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.3%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

9.8

Technische Schwere

Beschreibung

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Application Policy Infrastructure Controller (APIC) engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76499 are related to improper neutralization issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-707.  

Erkennung & Indikatoren

Ausnutzung

In den geprüften Quellen nicht genannt

Behobene Versionen

  • 6.0(9h)
  • 6.1(6g)
  • 6.2(3g)

Threat-Hunting-Queries

CVE-2026-76499 addresses improper neutralization issues (CWE-707), which can lead to command, OS, or argument injection. Detection should focus on unusual process execution or command-line arguments initiated by the Cisco APIC.

Sentinel/Defender KQL

DeviceProcessEvents
| where InitiatingProcessFileName =~ "APIC_Process_Name.exe" // Replace with actual APIC process name
| where ProcessCommandLine has_any ("cmd.exe", "powershell.exe", "sh", "bash") and ProcessCommandLine !has_any ("legitimate_APIC_commands") // Exclude known legitimate commands
| project Timestamp, DeviceName, InitiatingProcessFileName, ProcessCommandLine, FileName, FolderPath

Splunk SPL

index=your_index_name sourcetype=your_sourcetype_name (source_process="APIC_Process_Name.exe" OR parent_process="APIC_Process_Name.exe") (command_line=*cmd.exe* OR command_line=*powershell.exe* OR command_line=*sh* OR command_line=*bash*) NOT (command_line="*legitimate_APIC_commands*")

Sigma

title: Cisco APIC Improper Neutralization Attempt
id: 00000000-0000-0000-0000-000000000001
status: experimental
description: Detects potential command, OS, or argument injection attempts originating from Cisco APIC processes.
author: SecBoard
date: 2026/10/07
logsource:
  category: process_creation
  product: windows # or linux
detection:
  selection:
    ParentImage|endswith: 'APIC_Process_Name.exe' # Replace with actual APIC process name
    CommandLine|contains:
      - 'cmd.exe'
      - 'powershell.exe'
      - 'sh'
      - 'bash'
  filter:
    CommandLine|contains:
      - 'legitimate_APIC_commands' # Exclude known legitimate commands
  condition: selection and not filter
level: high

Elastic ES|QL

from process where process.parent.executable == "APIC_Process_Name.exe" and (process.args : ("cmd.exe", "powershell.exe", "sh", "bash") and not process.args : ("legitimate_APIC_commands"))

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

Referenzen