Is this vulnerability remotely exploitable over the internet?

It can be, but only if the controller's Dqlite port is exposed to untrusted networks. In many deployments, this port is restricted to internal or management networks. However, any environment where the Dqlite port is reachable from untrusted hosts is at high risk.

What level of access does an attacker need to exploit this?

The attacker needs only network-level reachability to the Juju controller's Dqlite endpoint. No valid client certificate, credentials, or prior authentication are required due to the missing certificate validation and authentication on cluster joins.

What is the safest general fix pattern for this issue?

The safest pattern is to enforce strict mutual TLS for all Dqlite cluster communication, validating client certificates and node identity before allowing any node to join the cluster, combined with restricting network access to the Dqlite port to a small, well-defined set of trusted hosts.

Severity:

CRITICAL RISK

(10.0)

Missing TLS Certificate Validation (CWE-295) in Juju Dqlite Controller Cluster

CVE-2026-4370

Published:

Apr 1, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Authentication and Certificate Validation Weakness

CWE:

CWE-295;CWE-306

Impact:

Complete Database Compromise and Controller Takeover

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication and Certificate Validation Weakness

CWE:

CWE-295;CWE-306

Impact:

Complete Database Compromise and Controller Takeover

Severity:

CRITICAL RISK

(10.0)

CVSS Version:

3.1

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Missing TLS Certificate Validation (CWE-295) in Juju Dqlite Controller Cluster

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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