CVE-2017-0059 is an information disclosure vulnerability in Microsoft Internet Explorer. CISA added it to the Known Exploited Vulnerabilities catalogue on 28 March 2022, which means attackers have used it in real attacks. Microsoft Internet Explorer allow remote attackers to obtain sensitive information from process memory via a crafted web site.
What this vulnerability means in practice
Information disclosure flaws in a browser matter because the attacker does not need to fully compromise the device to learn something useful. In this case, a crafted web page can cause Microsoft Internet Explorer to reveal sensitive data from process memory, which can expose internal state that was never meant to be visible to the browser context.
That kind of leakage is dangerous because memory often contains more than a single page’s content. It can include session-related material, tokens, page data, pointers, or other transient information that helps an attacker understand the target environment and chain the issue with other bugs or social engineering.
For the official record and advisory trail, readers should use the CVE Program entry structure together with the NIST National Vulnerability Database, which are the standard references for vulnerability identification and documentation.
How organisations assess exposure
The first question is whether the affected browser is still present anywhere in the environment, including legacy hosts, virtual desktops, line-of-business systems, or compatibility modes that may silently preserve old browser behaviour. Exposure assessment is not just about installed software, it is about where users can still reach the vulnerable component.
Internet exposure matters too. A browser flaw becomes more urgent when users can browse untrusted content from the public web, email links, embedded portals, or third-party sites. Vendor advisories and enterprise software inventories should be checked together so that the organisation can identify where the vulnerable browser is still reachable and where compensating controls are already in place.
The best-practice workflow is to pair asset inventory with vulnerability prioritisation. NHIMG’s Vulnerability Management Guide aligns with this approach by centring scope, prioritisation, exception handling, and verification rather than treating every CVE as equal.
Remediation and compensating controls
The safest outcome is to remove exposure through vendor remediation as soon as authoritative guidance says it is available for the exact CVE. Where immediate remediation is not possible, organisations should narrow attack surface by limiting use of the vulnerable browser, reducing browsing to trusted destinations, and hardening systems that still depend on it for compatibility.
Compensating controls matter most when legacy dependencies delay retirement. Application control, web filtering, sandboxing, and strict separation between everyday browsing and sensitive administrative tasks can reduce the chance that a single malicious site turns into a useful foothold. Those controls do not cure the bug, but they can make exploitation harder and less valuable.
When the issue sits inside broader vulnerability operations, a structured prioritisation process helps avoid drift. NHIMG’s Vulnerability Management Guide is useful here because it treats remediation as a lifecycle process, not a one-time patch event.
Detection and post-exploitation review
Information disclosure is often a precursor to follow-on activity, so defenders should look for signs that the vulnerability was used as part of a larger chain. The immediate goal after suspected exploitation is to determine what data may have been exposed and whether the attacker used that knowledge to move to a second stage.
Post-patch review should therefore include browsing telemetry, endpoint investigation, and checks for unusual downloads, new persistence, or suspicious follow-up requests from the same host. If the compromise path is unknown, treat the event as a potential precursor to credential theft, phishing refinement, or targeted lateral movement rather than as a harmless leak.
Where browser exploitation is part of a broader intrusion pattern, the State of NHI & AI Agent Breach Report offers useful breach-pattern context for how exposed secrets and stolen session material often become the next attack step.
Risk and Threat Considerations
This vulnerability matters because process-memory disclosure can turn a simple web visit into an information-gathering step for an attacker. Even when the flaw does not immediately grant code execution, the leaked material can help the attacker refine exploitation, harvest useful page data, or identify higher-value credentials and sessions on the same endpoint.
Failure mechanism: A crafted site triggers browser behaviour that exposes sensitive process memory, and the attacker captures information that was only ever intended to exist transiently inside the browser process.
Impact: The leaked data can support follow-on compromise, increase the value of the victim host, and widen the blast radius if the memory content includes authentication material, application state, or security-sensitive context.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | CVE-driven remediation requires timely flaw handling for the affected browser component. |
| SI-4 — System Monitoring | Memory-disclosure exploitation calls for monitoring of suspicious browsing and post-exploit activity. | |
| Recommendation — Track and remediate the browser flaw under SI-2 using approved patch and mitigation workflows. Use SI-4 to detect suspicious page loads, exploit indicators, and follow-on compromise behavior. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | This CVE is an exploited vulnerability, so prioritisation and verification are central to exposure control. |
| CIS-13 — Network Monitoring and Defense | Network and endpoint telemetry help identify exploit attempts and post-exploitation browsing activity. | |
| Recommendation — Prioritise the CVE in your vulnerability management process and verify remediation on exposed systems. Correlate web and endpoint telemetry to detect exploit attempts and suspicious follow-on activity. | ||
| ISO/IEC 27001:2022 | A.8.8 — Management of technical vulnerabilities | The term is a live vulnerability requiring formal identification, prioritisation, and remediation. |
| Recommendation — Manage the CVE as a technical vulnerability with documented ownership, prioritisation, and remediation tracking. | ||
Practitioner Guidance
What to watch for: Treat any confirmed exploitation as an endpoint investigation, not just a patching task. Browser-memory disclosure issues deserve review of user activity, session exposure, and any downstream actions that may have followed the initial visit to a malicious page.
Governance implication: Legacy browser risk should have an owner, an exception path, and a retirement plan. If the business still depends on the affected component, document the dependency explicitly so that compensating controls and user restrictions do not disappear during routine operations.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org