CVE-2025-62763
📋 TL;DR
This CVE describes a Server-Side Request Forgery (SSRF) vulnerability in Zimbra Collaboration Suite (ZCS) versions before 10.1.12, caused by misconfigured chat proxy settings. Attackers can exploit this to make unauthorized requests from the Zimbra server to internal network resources. All Zimbra installations running vulnerable versions with chat features enabled are affected.
💻 Affected Systems
- Zimbra Collaboration Suite (ZCS)
⚠️ 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 access internal services, exfiltrate sensitive data, or pivot to other systems within the network.
Likely Case
Information disclosure from internal services, potential credential harvesting from metadata services.
If Mitigated
Limited to chat functionality disruption if proper network segmentation exists.
🎯 Exploit Status
Exploitation requires understanding of Zimbra's chat proxy configuration and network access to the service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.1.12
Vendor Advisory: https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Restart Required: No
Instructions:
1. Backup your Zimbra installation. 2. Download Zimbra 10.1.12 from official sources. 3. Follow Zimbra upgrade documentation for your platform. 4. Verify chat proxy configuration is properly restricted after upgrade.
🔧 Temporary Workarounds
Disable Chat Functionality
allTemporarily disable Zimbra chat features to eliminate the attack vector.
zmprov mcf zimbraChatEnabled FALSE
zmmailboxdctl restart
Restrict Chat Proxy Network Access
allConfigure firewall rules to limit chat proxy outbound connections.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Zimbra servers from sensitive internal resources.
- Deploy web application firewall (WAF) rules to detect and block SSRF patterns.
🔍 How to Verify
Check if Vulnerable:
Check Zimbra version with: zmcontrol -v. If version is below 10.1.12 and chat is enabled, system is vulnerable.Check Version:
zmcontrol -vVerify Fix Applied:
Confirm version is 10.1.12 or higher with zmcontrol -v and verify chat proxy configuration in admin console.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound requests from Zimbra server to internal IPs
- Chat proxy error logs showing unexpected destinations
Network Indicators:
- Outbound connections from Zimbra server to unexpected internal services on non-standard ports
SIEM Query:
source="zimbra.log" AND ("chat-proxy" OR "xmpp") AND (destination_ip=10.* OR destination_ip=172.16.* OR destination_ip=192.168.*)