Yes. CISA added CVE-2014-2817 to its Known Exploited Vulnerabilities catalogue on 25 May 2022, which it does only when there is reliable evidence of active exploitation. CISA has not linked it to known ransomware campaigns. Microsoft Internet Explorer cotains an unspecified vulnerability that allows remote attackers to gain privileges via a crafted web site. Any organisation running the affected product should treat remediation as urgent.
What “being exploited in the wild” means for this CVE
For an organisation, the practical meaning is simple: this is not a theoretical browser flaw to track for later. CISA’s inclusion in KEV indicates observed active exploitation, so exposure should be treated as a live security condition, not a baseline patch backlog item. The question is whether any Internet Explorer instances remain reachable in your environment.
If Internet Explorer is still present, confirm whether it is enabled for users, embedded in legacy workflows, or accessible through compatibility settings on managed endpoints. The remediation urgency comes from exploitability in ordinary browsing paths, especially where users can be steered to crafted sites or where legacy browser use is still permitted.
How to confirm exposure and reduce attack surface fast
Start with asset discovery: identify desktops, VDI images, kiosks, and older Windows builds where Internet Explorer may still exist even if it is not the default browser. Then check whether policy, shortcuts, automation, or application dependencies can still launch it. In many environments, the risk is persistence through legacy configuration rather than obvious day-to-day use.
Where the browser is not required, disable or remove access paths, restrict execution through policy, and validate that users cannot fall back to it through old links or compatibility exceptions. CISA Known Exploited Vulnerabilities Catalog should be used as the authoritative prioritisation reference, while the vendor advisory remains the source for version-specific remediation detail.
When you are dealing with a widely exploited browser flaw, your goal is to collapse the reachable surface before attackers can turn user web traffic into privilege gain. Legacy browser exposure is often a policy problem, not just a software version problem.
What to do if patching or replacement must wait
If immediate remediation is blocked by an application dependency, treat the exception as temporary and bounded. Reduce exposure by tightening browser restrictions, limiting who can access the affected host set, and separating high-risk users or systems from legacy browsing workflows. This is especially important where the browser can be reached from privileged or administrative endpoints.
Monitor for signs that the environment has already been probed through a malicious site or browser exploit chain. If Internet Explorer access must remain available, pair the exception with heightened logging, endpoint detection coverage, and a plan to retire the dependency quickly. NIST National Vulnerability Database and the vendor’s own security guidance help confirm record details, but they do not replace local exposure validation.
If the browser was reachable before mitigation, review whether credential theft, token capture, or post-exploitation activity occurred on the affected systems. A privilege escalation flaw can be used as the next step after initial code execution or drive-by access, so post-fix verification matters as much as the patch itself.
Risk and Threat Considerations
Exploitation of a browser privilege escalation bug can turn a low-friction web visit into elevated access on the endpoint. That changes the threat from nuisance browsing risk to potential system compromise, persistence, and follow-on credential theft, especially on hosts where users retain local or administrative privileges.
Failure mechanism: A crafted website or hostile content triggers the browser flaw, then the attacker uses the resulting privilege gain to run further actions on the local system, steal material, or prepare lateral movement.
Impact: The affected endpoint may be used for deeper compromise, with possible exposure of credentials, sessions, and locally accessible data, followed by broader internal access if the host is trusted elsewhere.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while NIST CSF 2.0, NIST SP 800-53 Rev 5 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | ID.RA-01 — Asset Vulnerability Identification | This is about identifying exposure to a known exploited browser vulnerability. |
| PR.PS-02 — Software, Data and Information Integrity | Active exploitation makes browser integrity and safe execution controls directly relevant. | |
| Recommendation — Identify affected systems and track this CVE in your risk register. Apply integrity controls that reduce malicious browser-driven code execution paths. | ||
| NIST SP 800-53 Rev 5 | RA-5 — Vulnerability Monitoring and Scanning | The question is whether a known exploited vulnerability is present and urgent. |
| SI-2 — Flaw Remediation | This CVE requires urgent remediation once exposure is confirmed. | |
| AC-6 — Least Privilege | Privilege escalation becomes more damaging when users or endpoints have excess privilege. | |
| Recommendation — Scan for exposure and validate whether the vulnerable browser remains enabled. Patch or mitigate the browser flaw without delay and track exception closure. Reduce local and administrative privilege to limit post-exploit impact. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | KEV-listed exploitation makes continuous prioritisation and remediation central. |
| CIS-4 — Secure Configuration of Enterprise Assets and Software | Disabling or constraining Internet Explorer is a configuration control question. | |
| Recommendation — Prioritise and remediate KEV-listed vulnerabilities ahead of routine backlog work. Harden endpoints to prevent use of the vulnerable browser and legacy launch paths. | ||
| MITRE ATT&CK | T1068 — Exploitation for Privilege Escalation | The CVE is a privilege escalation flaw with active exploitation. |
| Recommendation — Map observed exploitation to privilege-escalation hunting and containment. | ||
Practitioner Guidance
What to prioritise: Confirm whether Internet Explorer is still executable anywhere in the fleet, then prioritise systems where users have broad access, cached credentials, or privileged workflows. Those are the endpoints most likely to turn a browser exploit into meaningful organisational impact.
What to verify: After remediation, verify that the browser cannot be launched through legacy shortcuts, embedded links, compatibility modes, or application exceptions. Also verify that the same hosts have not shown abnormal child processes, new persistence, or unusual sign-in behaviour around the exposure window.
Practitioner takeaway: For an actively exploited browser CVE, the real decision is not whether to patch, but how quickly you can eliminate every remaining path to the vulnerable browser and then prove nothing else was gained from the exposure.
Related resources from NHI Mgmt Group
- Guide: Enterprise Browser and Browser Security Guide
- Is CVE-2014-4123 (Microsoft Internet Explorer Privilege Escalation) being exploited in the wild?
- CVE-2014-2817 (Microsoft Internet Explorer Privilege Escalation)
- Is CVE-2014-1812 (Microsoft Windows Group Policy Preferences Password Privilege Escalation) being exploited in the wild?
- CVE-2014-4123 (Microsoft Internet Explorer Privilege Escalation)