CVE-2026-20115 Overview
A vulnerability in Cisco IOS XE Software for Cisco Meraki could allow a remote, unauthenticated attacker to view confidential device information. This vulnerability is due to a device configuration upload being performed over an insecure tunnel. An attacker could exploit this vulnerability by conducting an on-path attack between the affected device and the Cisco Meraki Dashboard. A successful exploit could allow the attacker to view sensitive device configuration information.
Critical Impact
Unauthenticated attackers can intercept and view sensitive device configuration data through man-in-the-middle attacks on insecure communication channels between Cisco Meraki devices and the Dashboard.
Affected Products
- Cisco IOS XE Software for Cisco Meraki devices
- Cisco Meraki Dashboard integration components
- Network infrastructure utilizing Meraki cloud management
Discovery Timeline
- 2026-03-25 - CVE-2026-20115 published to NVD
- 2026-03-26 - Last updated in NVD database
Technical Details for CVE-2026-20115
Vulnerability Analysis
This vulnerability falls under CWE-319 (Cleartext Transmission of Sensitive Information), indicating that the affected Cisco IOS XE Software transmits device configuration data over an insecure communication channel. The vulnerability exists in the mechanism that handles configuration uploads between Cisco Meraki devices and the Cisco Meraki Dashboard.
The attack requires the adversary to be positioned on the network path between the affected device and the Meraki Dashboard, making this a classic man-in-the-middle scenario. While user interaction is required and the attack complexity is elevated due to the on-path positioning requirement, successful exploitation results in high confidentiality impact with the potential to expose sensitive device configuration details.
Root Cause
The root cause of this vulnerability is the use of an insecure tunnel for device configuration uploads. When Cisco Meraki devices communicate configuration data to the Cisco Meraki Dashboard, this transmission occurs over a channel that lacks adequate encryption or security controls. This cleartext transmission (CWE-319) enables attackers with network positioning capabilities to intercept and read sensitive configuration information.
Attack Vector
The attack vector for CVE-2026-20115 is network-based, requiring the attacker to position themselves on the network path between the vulnerable Cisco IOS XE device and the Cisco Meraki Dashboard. This on-path (man-in-the-middle) positioning allows the attacker to intercept configuration uploads transmitted over the insecure tunnel.
The exploitation flow involves:
- Attacker establishes an on-path position in the network infrastructure
- Affected device initiates a configuration upload to Cisco Meraki Dashboard
- Attacker intercepts the insecure tunnel communication
- Sensitive device configuration information is exposed to the attacker
Due to the nature of this vulnerability, no code example is applicable. The vulnerability exists in the transport layer security implementation rather than in application-level code. For detailed technical information, refer to the Cisco Security Advisory.
Detection Methods for CVE-2026-20115
Indicators of Compromise
- Unexpected network traffic interception patterns between Meraki devices and the Dashboard
- Anomalous network positioning or ARP spoofing activities on segments hosting Meraki infrastructure
- Unencrypted configuration data observed in network traffic captures
- Evidence of man-in-the-middle attack tools or techniques on network segments
Detection Strategies
- Monitor network traffic for cleartext configuration data transmissions from Meraki devices
- Implement network intrusion detection rules to identify potential MITM attack patterns
- Deploy anomaly detection for unusual traffic routing between Meraki devices and the Dashboard
- Review network logs for indicators of ARP spoofing or DNS hijacking attempts
Monitoring Recommendations
- Enable comprehensive logging on network infrastructure to track traffic flows
- Implement network segmentation monitoring to detect unauthorized lateral movement
- Deploy packet capture capabilities on critical network segments for forensic analysis
- Monitor for unauthorized devices appearing on network paths to Meraki Dashboard
How to Mitigate CVE-2026-20115
Immediate Actions Required
- Review the Cisco Security Advisory for specific patch information
- Assess network architecture to identify potential MITM attack points
- Implement network segmentation to limit exposure of Meraki device traffic
- Enable enhanced monitoring on network paths between Meraki devices and Dashboard
Patch Information
Cisco has released a security advisory addressing this vulnerability. Organizations should consult the Cisco Security Advisory for specific patch and upgrade guidance. Apply vendor-recommended updates to Cisco IOS XE Software as soon as they become available to address the insecure tunnel communication issue.
Workarounds
- Implement strict network access controls to prevent unauthorized on-path positioning
- Deploy network segmentation to isolate Meraki management traffic from untrusted network segments
- Enable additional authentication mechanisms for network infrastructure devices
- Consider VPN tunneling for Meraki Dashboard communications where applicable
# Network segmentation example for Meraki management traffic
# Consult Cisco documentation for device-specific configuration
# Example: Create dedicated management VLAN for Meraki communications
# interface Vlan100
# description Meraki-Management-Traffic
# ip access-group MERAKI-MGMT-ACL in
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
