Why do internet-facing firewalls and access gateways increase identity risk?

Why Internet-Facing Gateways Raise Identity Risk

Internet-facing firewalls and access gateways are not passive network boxes. They terminate sessions, broker authentication, enforce administrative access, and often hold the very secrets needed to reach downstream systems. That makes them part of the identity control plane. When attackers compromise the appliance, they may inherit tokens, certificates, cached credentials, or trust relationships that were meant to protect everything behind it.

This is why identity risk rises even when internal systems are segmented. The appliance becomes a high-value pivot point, and compromise can convert a network foothold into privileged access. Current guidance from OWASP Non-Human Identity Top 10 and NIST Cybersecurity Framework 2.0 both reinforce the need to treat identity-bearing infrastructure as a protected asset, not just an edge device. NHIMG research on the Ultimate Guide to NHIs shows that 80% of identity breaches involved compromised non-human identities such as service accounts and API keys. In practice, many security teams discover this only after a gateway has already been used to harvest secrets and move laterally.

How the Risk Actually Emerges in Operations

The risk increases because gateways usually sit where trust is concentrated. They may validate user logins, issue or relay short-lived credentials, integrate with SSO, proxy admin traffic, inspect certificates, or store configuration secrets for upstream connections. If an attacker reaches the management plane, they can often extract enough material to impersonate legitimate workflows or tamper with authentication decisions.

Effective control starts by separating functions that are often collapsed into one device:

• Administrative access should be isolated from public traffic and protected with strong MFA, device posture checks, and dedicated break-glass paths.
• Secrets used by the gateway should be short-lived where possible, rotated aggressively, and stored outside the appliance in managed vaults.
• Logging should capture admin actions, auth events, policy changes, token issuance, and unusual trust modifications.
• Privilege should be minimized so the gateway can broker access without becoming a credential warehouse.

That model aligns with the broader NHI lifecycle described in the Ultimate Guide to NHIs and with breach pattern analysis in the 52 NHI Breaches Analysis, where exposed secrets and over-privileged identities repeatedly turn a single compromise into broader access. For implementation detail, teams should map gateway identity flows against OWASP Non-Human Identity Top 10 and apply the control logic in NIST Cybersecurity Framework 2.0 to harden access, monitor anomalies, and reduce blast radius. These controls tend to break down when the gateway is also used as a secrets store and configuration authority across multiple environments because compromise then exposes both authentication paths and operational trust.

Common Variations and Edge Cases

Tighter gateway control often increases operational overhead, requiring organisations to balance resilience against uptime, change velocity, and supportability. That tradeoff is real, especially in environments that rely on legacy appliances or vendor-managed access stacks.

There is no universal standard for this yet, but current guidance suggests a few patterns. In zero trust designs, the gateway should not be treated as a trust anchor by default; it should be one policy enforcement point among many. In remote admin scenarios, JIT access is preferable to standing administrative access, because the appliance itself becomes a target for credential capture. In highly regulated environments, the risk is amplified when a gateway also handles audit logging, certificate termination, and privileged routing, since one compromise can affect both identity assurance and evidence integrity.

Edge cases include shared appliances across business units, externally managed VPN concentrators, and hybrid deployments where cloud identity connects to on-prem infrastructure through a single choke point. In those cases, security teams should assume the gateway will be probed for secrets, configuration drift, and stale trust relationships. The practical takeaway is to reduce what the device knows, shorten what it can use, and monitor it as a high-value identity asset rather than a generic perimeter control.

Related resources from NHI Mgmt Group

• Why do non-human identities increase zero trust risk?
• Why do disconnected apps increase identity and access risk?
• Why do MCP deployments increase identity and access risk?
• Why do browser extensions increase identity and access risk?