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CVE-2026-84393

HIGH(8.1)

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

Risk Signal Score20/100 — NIEDRIG
  • CVSS 8.1 — Hoch

Erwähnungen (letzte 60 Tage)

Artikel

EPSS-Score

0.2%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

8.1

Technische Schwere

Beschreibung

A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow attacker to information disclosure via <insert attack vector here>

Erkennung & Indikatoren

Ausnutzung

In den geprüften Quellen nicht genannt

Threat-Hunting-Queries

Based on the vulnerability type (improper validation of certificate with host mismatch), detection would likely involve monitoring for unusual certificate validation failures or network traffic patterns indicative of a man-in-the-middle attack. Specific IOCs are not available in the provided source.

Sentinel/Defender KQL

// This is a placeholder. Specific KQL for certificate validation issues or host mismatches would depend on detailed logging of TLS/SSL events and certificate validation outcomes, which is often not directly available in standard logs.
// Consider monitoring network traffic logs for anomalies related to certificate usage or unexpected connections.
// Example (conceptual, requires specific log sources): DeviceTvmSecureConfigurationAssessment
// | where ConfigurationId == "CertificateValidation" and Result == "Failed"
// | summarize count() by DeviceName, DeviceIp

Splunk SPL

# This is a placeholder. Specific SPL for certificate validation issues or host mismatches would depend on detailed logging of TLS/SSL events and certificate validation outcomes.
# Consider monitoring network traffic logs for anomalies related to certificate usage or unexpected connections.
# Example (conceptual, requires specific log sources):
# index=your_network_index sourcetype=your_tls_logs (certificate_error OR host_mismatch)
# | stats count by host, src_ip, dest_ip, certificate_subject

Sigma

# This is a placeholder. Specific Sigma rules for certificate validation issues or host mismatches would depend on detailed logging of TLS/SSL events and certificate validation outcomes.
# Consider monitoring network traffic logs for anomalies related to certificate usage or unexpected connections.
# Example (conceptual, requires specific log sources):
# title: Potential Certificate Host Mismatch
# id: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
# status: experimental
# description: Detects potential certificate host mismatch issues based on log data.
# logsource:
#   category: network
#   product: generic
# detection:
#   selection:
#     EventID: 'CertificateValidationError'
#     Details|contains: 'host mismatch'
#   condition: selection
# level: medium

Elastic ES|QL

// This is a placeholder. Specific ES|QL for certificate validation issues or host mismatches would depend on detailed logging of TLS/SSL events and certificate validation outcomes.
// Consider monitoring network traffic logs for anomalies related to certificate usage or unexpected connections.
// Example (conceptual, requires specific log sources):
// FROM your_network_logs
// WHERE event.category == "network" AND (message : "certificate validation error" OR message : "host mismatch")
// GROUP BY host.name, source.ip, destination.ip
// AGGREGATE count()

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Referenzen