CVE-2025-12657 Overview
CVE-2025-12657 affects the Key Management Interoperability Protocol (KMIP) response parser embedded in MongoDB binaries. The parser accepts certain malformed KMIP response packets and constructs invalid internal objects from them. Subsequent reads against these objects can trigger read access violations, causing the MongoDB process to terminate.
The issue is tracked by MongoDB under SERVER-101230 and is classified under [CWE-754] (Improper Check for Unusual or Exceptional Conditions). Exploitation requires the MongoDB instance to communicate with an attacker-influenced KMIP server, which limits the practical exposure to environments using external key management.
Critical Impact
A malicious or compromised KMIP server can send crafted responses that crash MongoDB processes, resulting in denial of service against database availability.
Affected Products
- MongoDB Server binaries with KMIP client support enabled
- MongoDB Enterprise deployments configured for KMIP-based encryption-at-rest key management
- Any MongoDB binary linking the affected KMIP response parser
Discovery Timeline
- 2025-11-03 - CVE-2025-12657 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-12657
Vulnerability Analysis
MongoDB binaries include a client-side KMIP response parser used when the database retrieves encryption keys from an external Key Management Interoperability Protocol server. The parser handles TTLV (Tag, Type, Length, Value) encoded KMIP responses returned during key retrieval and management operations.
The parser is overly permissive when validating malformed input. Instead of rejecting non-conforming packets, it constructs internal objects that violate the parser's own invariants. When downstream code later dereferences fields on these malformed objects, the process performs an invalid memory read.
The result is a read access violation that terminates the MongoDB process. The Exploit Prediction Scoring System (EPSS) probability of 0.365% reflects the narrow attack surface, since the vulnerability requires the target to interact with an attacker-controlled or compromised KMIP endpoint.
Root Cause
The root cause is improper handling of exceptional conditions [CWE-754] in the KMIP response parser. The parser does not enforce sufficient structural validation on incoming TTLV elements, allowing malformed packets to populate object fields with invalid values or leave required fields uninitialized.
Attack Vector
An attacker must control or compromise the KMIP server that a MongoDB instance is configured to query, or occupy a network position permitting response tampering. Once positioned, the attacker returns a crafted KMIP response to a legitimate key retrieval request. The MongoDB parser accepts the malformed response, and a later read against the resulting object crashes the mongod or mongos process. Repeated exploitation prevents the database from starting or completing key operations, producing a sustained denial of service.
Detection Methods for CVE-2025-12657
Indicators of Compromise
- Unexpected mongod or mongos process crashes with segmentation fault or access violation signatures in system logs
- KMIP client errors or truncated key retrieval sessions recorded in MongoDB logs around the time of process termination
- Unscheduled TCP resets or connection anomalies between MongoDB hosts and configured KMIP endpoints
Detection Strategies
- Monitor MongoDB server logs for repeated crashes correlated with KMIP key retrieval operations at startup or during key rotation
- Inspect network telemetry for KMIP responses originating from unexpected sources or containing anomalous TTLV structures
- Alert on core dumps generated by mongod or mongos processes and preserve them for forensic analysis
Monitoring Recommendations
- Enable verbose KMIP client logging in MongoDB to capture parser errors and response metadata
- Track availability metrics for the KMIP server and mutual TLS certificate validation failures
- Correlate database uptime alerts with KMIP session activity in a centralized log platform
How to Mitigate CVE-2025-12657
Immediate Actions Required
- Apply the MongoDB patch referenced in SERVER-101230 once available for your deployed release train
- Restrict network paths so that MongoDB instances only reach approved KMIP servers through authenticated, mutually authenticated TLS channels
- Audit KMIP server access controls and rotate credentials or certificates if compromise is suspected
Patch Information
MongoDB tracks the fix in the internal ticket SERVER-101230. Administrators should consult the MongoDB release notes for the specific server versions that incorporate the corrected KMIP response parser and upgrade affected binaries accordingly.
Workarounds
- Limit KMIP connectivity to a hardened, isolated management network segment reachable only by database hosts
- Enforce mutual TLS between MongoDB and the KMIP server and pin the server certificate to prevent response tampering
- Where operationally acceptable, switch to a supported alternative key management integration until patched binaries are deployed
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.