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CVE-2026-76464

CRITICAL(9.6)

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

Risk Signal Score24/100 — NIEDRIG
  • CVSS 9.6 — Kritisch

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.2%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

9.6

Technische Schwere

Beschreibung

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco networking engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by this CVE-2026-76464 are related to buffer management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-119.

Erkennung & Indikatoren

Ausnutzung

These vulnerabilities were found during internal testing and are not known to be actively exploited.

Threat-Hunting-Queries

CVE-2026-76464 addresses buffer management issues (CWE-119). Detection should focus on abnormal memory usage, crashes, or unexpected process termination in Cisco Meraki devices.

Sentinel/Defender KQL

DeviceProcessEvents
| where FileName in ("meraki_process_name_1", "meraki_process_name_2") // Replace with actual Meraki process names
| where ProcessCommandLine contains "malicious_pattern" // Look for suspicious command line arguments
| summarize count() by DeviceName, FileName, ProcessCommandLine
| where count_ > 5 // Adjust threshold as needed for abnormal activity
| project DeviceName, FileName, ProcessCommandLine, count_

Splunk SPL

index=meraki_logs sourcetype=meraki_process_events (process="meraki_process_name_1" OR process="meraki_process_name_2") (memory_usage > 90 OR crash_event=true OR unexpected_termination=true)
| stats count by host, process, memory_usage, crash_event, unexpected_termination
| where count > 5

Sigma

title: Cisco Meraki Buffer Overflow Attempt
id: 00000000-0000-0000-0000-000000000000
status: experimental
description: Detects potential buffer overflow attempts or abnormal memory behavior in Cisco Meraki devices related to CVE-2026-76464.
author: SecBoard
date: 2026/10/07
logsource:
  product: meraki
  service: process_monitoring
detection:
  selection:
    EventID: "ProcessCrash" # Example Event ID for process crashes
    ProcessName|endswith:
      - "meraki_process_name_1.exe"
      - "meraki_process_name_2.exe"
    MemoryUsage:
      - '>90'
  condition: selection
level: high

Elastic ES|QL

from meraki_logs
| where event.category == "process" and event.type == "end" and process.name in ("meraki_process_name_1", "meraki_process_name_2")
| where process.exit_code != 0 or process.memory.usage > 90
| stats count() by host.name, process.name, process.exit_code, process.memory.usage
| where count() > 5

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

Referenzen