CVE-2025-30188
📋 TL;DR
This vulnerability allows attackers to flood caches with excessive data through API requests, causing legitimate cache entries to be evicted. This can lead to denial of service by making the web frontend unavailable. It affects systems running vulnerable versions of Open-Xchange AppSuite.
💻 Affected Systems
- Open-Xchange AppSuite
⚠️ 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
Complete unavailability of the web frontend component due to cache exhaustion, disrupting all user access to the affected service.
Likely Case
Intermittent service degradation or partial unavailability as legitimate cache data gets evicted under attack conditions.
If Mitigated
Minimal impact with proper rate limiting, cache size monitoring, and updated software.
🎯 Exploit Status
No known public exploits, but vulnerability is simple to trigger by sending excessive API requests to fill caches.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to vendor advisory for specific patched versions
Vendor Advisory: https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2025/oxas-adv-2025-0002.json
Restart Required: Yes
Instructions:
1. Review vendor advisory for affected versions. 2. Apply provided updates or patch releases. 3. Restart affected services. 4. Verify cache behavior is normalized.
🔧 Temporary Workarounds
Implement API Rate Limiting
linuxLimit the number of API requests per user/IP to prevent cache flooding
# Configure rate limiting in web server or application firewall
# Example for nginx: limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
Reduce Cache TTL/Sizes
allLower cache time-to-live or maximum size to limit impact of flooding
# Adjust cache configuration in application settings
# Example: cache.max_size=100MB, cache.ttl=300s
🧯 If You Can't Patch
- Implement strict API rate limiting and request validation
- Monitor cache usage metrics and set alerts for abnormal patterns
🔍 How to Verify
Check if Vulnerable:
Check if running affected Open-Xchange AppSuite version and review cache configuration for unlimited or large cache sizes.Check Version:
# For Open-Xchange: ox-version-check or check package version via dpkg/rpmVerify Fix Applied:
Verify updated version is installed and test API endpoints with high request volumes to ensure cache stability.📡 Detection & Monitoring
Log Indicators:
- Unusually high API request rates from single sources
- Cache eviction warnings or errors in application logs
- Increased cache miss rates
Network Indicators:
- Spike in API traffic patterns
- Repeated identical API requests from same IPs
SIEM Query:
source="appsuite" AND ("cache_eviction" OR "api_request_rate > threshold")