CVE-2025-20207
📋 TL;DR
This vulnerability allows authenticated attackers with SNMP credentials to obtain confidential operating system information from affected Cisco security appliances via crafted SNMP poll requests. It affects Cisco Secure Email and Web Manager, Cisco Secure Email Gateway, and Cisco Secure Web Appliance. The vulnerability exists because these appliances don't properly protect sensitive information in SNMP responses.
💻 Affected Systems
- Cisco Secure Email and Web Manager
- Cisco Secure Email Gateway
- Cisco Secure Web Appliance
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could obtain sensitive OS information that could be used for further attacks, potentially leading to system compromise or data exfiltration.
Likely Case
Information disclosure about the underlying operating system that could aid attackers in reconnaissance for targeted attacks.
If Mitigated
Limited impact with proper SNMP credential management and network segmentation.
🎯 Exploit Status
Requires SNMP credentials; exploitation involves sending crafted SNMP poll requests
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-sma-wsa-snmp-inf-FqPvL8sX
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions 2. Download and apply appropriate patches 3. Restart affected appliances 4. Verify patch installation
🔧 Temporary Workarounds
Disable SNMP
allDisable SNMP service on affected appliances if not required
Check appliance-specific documentation for SNMP disable commands
Restrict SNMP Access
allLimit SNMP access to trusted management networks only
Configure firewall rules to restrict SNMP (UDP 161) access
🧯 If You Can't Patch
- Implement strict SNMP credential management with strong passwords
- Segment SNMP traffic to isolated management networks only
🔍 How to Verify
Check if Vulnerable:
Check appliance version against Cisco advisory; verify if SNMP is enabled and accessibleCheck Version:
Check appliance web interface or CLI for version informationVerify Fix Applied:
Verify appliance version is updated to patched version; test SNMP responses for information disclosure📡 Detection & Monitoring
Log Indicators:
- Unusual SNMP poll requests
- Multiple failed SNMP authentication attempts
- SNMP requests from unexpected sources
Network Indicators:
- SNMP traffic to appliances from unauthorized sources
- Unusual SNMP query patterns
SIEM Query:
source_port=161 AND (dest_ip=appliance_ip) AND (event_type="snmp_query")