Detect MongoDB Improper Handling of Length Parameter Inconsistency (CVE-2025-14847) in Sumo Logic CSE
Detects exploitation attempts targeting CVE-2025-14847, an improper handling of length parameter inconsistency vulnerability (CWE-130) in MongoDB and MongoDB Server. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. Attackers may craft malformed requests with inconsistent length parameters to cause unexpected server behavior, potentially leading to denial of service, data corruption, or unauthorized access.
MITRE ATT&CK
- Tactic
- Initial Access Impact
Sumo Detection Query
_sourceCategory=mongodb* OR _sourceCategory=*mongod* OR _sourceName=*mongod*
| where _raw matches /(?i)(length.*inconsisten|bson.*invalid|assertion.*failed|malformed.*request|param.*mismatch)/
| parse regex "(?P<severity>WARNING|ERROR|SEVERE|FATAL)" nodrop
| parse regex "(?P<component>\w+)\s+\[" nodrop
| timeslice 5m
| count by _timeslice, _sourceHost, severity, component
| where _count > 0
| sort by _timeslice descSumo Logic query for MongoDB log sources detecting length parameter inconsistency patterns linked to CVE-2025-14847. Aggregates by time window, host, and severity for rapid triage.
Data Sources
Required Tables
False Positives & Tuning
- Noisy MongoDB warning messages from legitimate workloads during peak usage periods
- MongoDB version mismatch warnings between replica set members generating parameter errors
- Third-party monitoring agents querying MongoDB internals and triggering assertion paths
- Bulk data import operations that temporarily produce BSON length warnings
Other platforms for CVE-2025-14847
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Send Malformed BSON Message with Inconsistent Length to MongoDB
Expected signal: MongoDB diagnostic log should record a parse error, assertion failure, or connection reset. Network capture should show malformed wire protocol frame followed by TCP RST or server-side close.
- Test 2Fuzzing MongoDB Port with Length Boundary Payloads
Expected signal: Multiple connection events on port 27017 in rapid succession, followed by MongoDB log entries for parser errors or assertion failures for each boundary value tested.
- Test 3Verify MongoDB Version and Patch Status
Expected signal: MongoDB audit log (if enabled) records a connection and command execution from localhost. Authentication log shows anonymous or credential-less connection attempt.
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Get the full detection package for CVE-2025-14847 including response playbook, investigation guide, and atomic red team tests.