MongoDB Server Security Update (December 2025)

CVE:	CVE-2025-14847
Publication Date:	2025-Dec-19
Severity:	N/A
Reference:	CVE-2025-14847
Status:	Fixed

Overview

We have completed a comprehensive risk assessment regarding the December 2025 MongoDB Server Security Update. Based on a thorough review of our network infrastructure and security configurations, we have classified the overall risk to our environment as Low.

Strict network isolation and ingress controls effectively neutralize the vulnerability against external threats. While a minor internal configuration gap was identified in EPC v1.8.7, it does not expose the system to the public internet and will be fully remediated in the upcoming release (v1.8.8).

Technical details

The identified vulnerability (associated with CVE-2025-14847, known as "MongoBleed") affects the MongoDB wire protocol's handling of zlib-compressed messages. It allows an unauthenticated remote attacker to exploit a disparity in packet length validation, potentially causing the server to return uninitialized heap memory containing sensitive data.

However, the exploitability of this vulnerability is contingent upon establishing a direct network connection to the database port. Our infrastructure provides effective mitigation at the network layer:

• Network Isolation: The MongoDB cluster is deployed within a strictly isolated private subnet, inaccessible from the public internet.

• Ingress Controls: An audit of firewall rules and Security Groups confirms that no public ingress is permitted to the database ports (TCP 27017).

• Port Separation: External-facing load balancers and application servers (ports 80, 443) do not possess direct routing or forwarding capabilities to the database layer, severing the attack chain

Impact

• External Threat (Negligible): The attack vector requires direct connectivity to the database wire protocol. Since no such path exists from the public internet, external exploitation is effectively neutralized.

• Internal Exposure (Low): The open port in EPC v1.8.7 presents a minor internal exposure risk. This is strictly limited to the internal network context and does not facilitate data exfiltration to external actors.

Mitigation and workarounds

Upgrade EPC to v1.8.8 to fix this vulnerability.