CVE-2021-1302
📋 TL;DR
CVE-2021-1302 allows authenticated remote attackers to bypass authorization in Cisco SD-WAN vManage's web interface, enabling unauthorized configuration changes and access to sensitive information. This affects organizations using Cisco SD-WAN vManage software for network management.
💻 Affected Systems
- Cisco SD-WAN vManage
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could reconfigure network routing, intercept traffic, deploy malicious configurations, or gain administrative control over the SD-WAN infrastructure.
Likely Case
Unauthorized access to sensitive network configuration data, modification of policies, or privilege escalation within the management system.
If Mitigated
Limited impact with proper network segmentation, strong authentication, and monitoring of management interface access.
🎯 Exploit Status
Exploitation requires valid user credentials but bypasses authorization checks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.3.1, 20.4.1, or 20.5.1 and later
Vendor Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-abyp-TnGFHrS
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download and install the patched version from Cisco Software Center. 3. Reboot the vManage instance. 4. Verify functionality post-upgrade.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit access to the vManage web interface to trusted IP addresses only.
Configure firewall rules to restrict access to vManage management IP/port
Implement Strong Authentication
allEnforce multi-factor authentication and strong password policies for all vManage users.
Configure TACACS+/RADIUS with MFA for vManage authentication
🧯 If You Can't Patch
- Isolate vManage management interface from untrusted networks
- Implement strict monitoring and alerting for configuration changes
🔍 How to Verify
Check if Vulnerable:
Check vManage software version via CLI: 'show version' or web interface > System > Software.Check Version:
show versionVerify Fix Applied:
Confirm version is 20.3.1, 20.4.1, 20.5.1 or later using same commands.📡 Detection & Monitoring
Log Indicators:
- Unauthorized configuration changes
- User privilege escalation attempts
- Access from unusual IP addresses to management interface
Network Indicators:
- Unexpected configuration changes to SD-WAN policies
- Unauthorized API calls to vManage management interface
SIEM Query:
source="vmanage" AND (event_type="config_change" AND user NOT IN [authorized_admins])