CVE-2026-21977
📋 TL;DR
This vulnerability in Oracle Zero Data Loss Recovery Appliance allows unauthenticated attackers with network access to potentially read some data from the appliance software. Attack requires human interaction from someone other than the attacker and is difficult to exploit. Affects Oracle Zero Data Loss Recovery Appliance Software versions 23.1.0 through 23.1.202509.
💻 Affected Systems
- Oracle Zero Data Loss Recovery Appliance Software
⚠️ 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
Unauthorized access to sensitive backup metadata or configuration data stored in the recovery appliance
Likely Case
Limited information disclosure of non-critical appliance data due to exploitation difficulty
If Mitigated
No impact with proper network segmentation and access controls
🎯 Exploit Status
Vulnerability is difficult to exploit and requires human interaction from a third party
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 23.1.202509
Vendor Advisory: https://www.oracle.com/security-alerts/cpujan2026.html
Restart Required: Yes
Instructions:
1. Download latest patch from Oracle Support. 2. Apply patch following Oracle Recovery Appliance patching procedures. 3. Restart affected services/components.
🔧 Temporary Workarounds
Network Segmentation
allRestrict Oracle Net access to trusted networks only
Configure firewall rules to limit Oracle Net (typically port 1521) access to authorized systems only
Access Control Lists
allImplement network ACLs to restrict unauthenticated access
Use network devices or host-based firewalls to block unauthorized Oracle Net connections
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Recovery Appliance from untrusted networks
- Monitor for unusual Oracle Net connection attempts and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check Oracle Recovery Appliance version via appliance console or Oracle Enterprise ManagerCheck Version:
Check appliance version via Oracle Recovery Appliance console or 'opatch lsinventory' on appliance hostVerify Fix Applied:
Verify version is updated beyond 23.1.202509 and check patch application logs📡 Detection & Monitoring
Log Indicators:
- Unusual Oracle Net connection attempts from unauthorized sources
- Failed authentication attempts followed by data access patterns
Network Indicators:
- Oracle Net traffic from unexpected sources to Recovery Appliance
- Unusual data transfer patterns via Oracle Net
SIEM Query:
source_port=1521 AND (dest_ip=recovery_appliance_ip) AND (src_ip NOT IN trusted_networks)