What causes use of default credentials?

Why default credentials persist in the first place

Default credentials usually persist because deployment and hardening are separated from initial setup. A device, app, or cloud service ships with factory access, gets installed quickly, and is later assumed to be “someone else’s job” to secure. That gap is especially dangerous when passwords are documented, reused across many devices, or never forced to expire.

They also survive when teams treat the original login as a temporary convenience account instead of a real security control. In practice, attackers do not need a novel exploit if the environment still trusts the vendor default, and that is why exposed defaults remain a recurring entry path in product and infrastructure compromise. Guide to the Secret Sprawl Challenge is useful here because credential exposure and hardcoded access often travel together in the same operational blind spots.

For machine-to-machine and platform access, the issue is often compounded by lifecycle drift, where an installer credential, API key, or factory admin account is left in place long after provisioning. Guide to NHI Rotation Challenges explains why rotation and revocation become harder once defaults have been embedded into tooling, integrations, or embedded devices.

How attackers find and use default logins

Default credentials are attractive because they collapse the attack effort to simple discovery and login. Attackers commonly scan internet-facing systems, try published manufacturer defaults, and then move from access to enumeration, data theft, remote control, or further lateral movement. The problem is not authentication weakness in the abstract, it is that the authentication step was never meaningfully changed from its factory state.

Where the default account also has elevated permissions, the same login becomes a privilege shortcut. That is why the practical risk is not just unauthorized entry, but what the attacker can do immediately after entry, especially on routers, management consoles, webcams, appliances, admin panels, and embedded systems. OWASP Non-Human Identity Top 10 is relevant because default secrets and excessive privilege are common failure modes for service and device identities too.

Many real-world compromises begin with default credentials and then rely on the defender having no detection around first login, factory account use, or unusual geographic access. MITRE ATT&CK Enterprise Matrix is useful for mapping how credential access, privilege escalation, and post-compromise activity tend to unfold after the initial login succeeds.

What to fix before the asset ever reaches production

The most effective control is to eliminate defaults during commissioning, not after exposure. Every new system should be inventoried, the original admin path should be replaced, and any factory account that cannot be removed should be disabled or tightly restricted before the asset is connected to production networks. This is especially important for shared appliances and vendor-managed systems where one missed default can expose many downstream services.

Teams should also verify that default passwords are not being reintroduced through automation, imaging, or cloning. A secure rollout process should treat credential setup as part of the deployment gate, not as a post-install cleanup task. CISA Secure by Design reinforces the product-side expectation that systems should not ship in a state that leaves users reliant on unchanged defaults.

For systems that authenticate through API keys or machine credentials, the same discipline applies to secret issuance and rotation. API Key Management Guide is relevant where “default credentials” really means a shared bootstrap secret, a vendor key, or a factory token that should have been replaced at first use.

Risk and Threat Considerations

Default credentials create a low-cost, high-reward exposure because they are easy to discover, easy to automate against, and often present on assets that are otherwise hard to reach. Once a login is successful, the attacker may inherit the trust, reach, and privilege that the device or application was meant to provide.

Failure mechanism: The asset remains in its factory-authenticated state, so public scanners, opportunistic attackers, or automated bot traffic can test known defaults and obtain access without defeating the authentication mechanism itself.

Impact: Exposure can include administrative control, data theft, service disruption, persistence, credential harvesting, or pivoting into adjacent systems that trust the compromised asset.

Practitioner Guidance

What to verify: Confirm that no internet-facing or internally reachable asset is still accepting vendor defaults, shared onboarding passwords, or factory accounts after deployment. In reviews, check both the obvious admin interface and any secondary management path, rescue console, or embedded web panel.

What to prioritize: Focus first on assets with broad blast radius, such as edge devices, remote management interfaces, cluster admins, and appliances that hold service credentials or network reach. If a default login can touch production data or infrastructure, treat it as urgent regardless of whether exploitation has been observed.

Common mistake: Teams often assume a hidden or obscure management interface is safe because it is not publicly documented. Attackers routinely search for the exact opposite, and obscurity is not a control when defaults are still valid.

Practitioner takeaway: The real failure is not that defaults exist, it is that they remain trusted after deployment. The secure state is one where every default is replaced, verified, and monitored for reappearance.

Related resources from NHI Mgmt Group

• Guide: CWE Top 25 Guide
• How can organizations secure their MCP server credentials?
• Why do ephemeral credentials still leave risk in machine access models?
• When should organizations transition from static to dynamic credentials?
• What causes use of a default password?