CVE-2016-0162 (Microsoft Internet Explorer Information Disclosure)

What makes this vulnerability class dangerous in Internet Explorer

An information disclosure flaw in a browser matters because it can reveal information that the user expects to remain local, even when the attacker does not gain full code execution. In this case, the weakness is tied to JavaScript handling, which means a web page can become the delivery path for a privacy breach rather than just a nuisance or crash.

The practical danger is that browser flaws often look minor until they are paired with other techniques. Once an attacker can infer the presence of specific files, they can use that intelligence to tailor follow-on exploitation, confirm whether a target machine is interesting, or support broader intrusion planning.

How organisations should assess exposure

Exposure review starts with knowing where Internet Explorer still exists in the estate, whether it is enabled by policy, and whether it can be reached from user workflows that encounter untrusted web content. Because this CVE is on the CISA KEV catalogue, organisations should treat it as actively exploited and prioritise inventory-based confirmation over assumptions.

For authoritative version and patch details, use the vendor advisory and the NIST National Vulnerability Database alongside the CVE Program. Those sources anchor the record, while internal asset inventory and browser usage data tell you whether the issue is present in your environment.

Remediation and compensating controls

When a patch cannot be applied immediately, the goal is to reduce the chance that users can reach hostile content through the affected browser path. The most effective compensating controls are to narrow browser exposure, reduce access to untrusted sites, and remove unnecessary reliance on the affected software where possible.

Where the browser remains in use, isolate it from higher-trust workflows and limit the data available to the session. A vulnerability-management process that tracks exposure, prioritisation and verification helps turn the CVE record into an actionable remediation queue rather than a static advisory, as outlined in the Vulnerability Management Guide.

Detection and post-patch review

Detection should focus on whether suspicious browsing activity, unexpected file-probing behaviour, or unexplained user complaints align with the vulnerable window. Even after remediation, teams should review whether the exploit was used to map local file presence or to prepare a broader compromise chain.

If the browser flaw was exercised in a real incident, the follow-up question is not only whether the patch is installed, but whether the endpoint was used as a staging point for later activity. That is why vulnerability response should connect to endpoint review, browser telemetry, and any evidence of user interaction with malicious pages.

Risk and Threat Considerations

Because this vulnerability is already in the KEV catalogue, it should be treated as a real exploitation risk, not a theoretical browser bug. Information disclosure can be enough for an attacker to confirm local conditions, refine a payload, or identify users and machines worth targeting next.

Failure mechanism: Malicious JavaScript reaches the affected browser path and abuses the handling flaw to infer the presence of specific files on the local system.

Impact: The attacker gains reconnaissance about the endpoint environment, which can support targeted exploitation, increase the success rate of follow-on attacks, or expose sensitive local structure indirectly.

Practitioner Guidance

Why practitioners should care: Treat KEV-listed browser disclosures as operationally urgent because the security issue is not just data exposure, but the intelligence it gives an attacker about the target environment. Prioritise removal or containment of the exposed browser path before relying on routine patch cadence.

What to watch for: Look for users, hosts, or business units that still depend on the affected browser for legacy workflows, because those dependencies often become the real reason exposure persists. The strongest signal is not the CVE record alone, but the combination of active internet exposure, weak user segregation, and delayed patch validation.

Related resources from NHI Mgmt Group

• CVE-2013-7331 (Microsoft Internet Explorer Information Disclosure)
• CVE-2010-0249 (Microsoft Internet Explorer Use-After-Free)
• CVE-2010-0806 (Microsoft Internet Explorer Use-After-Free)
• CVE-2010-3962 (Microsoft Internet Explorer Uninitialized Memory Corruption)