CVE-2014-2817 is a privilege escalation vulnerability in Microsoft Internet Explorer. CISA added it to the Known Exploited Vulnerabilities catalogue on 25 May 2022, which means attackers have used it in real attacks. Microsoft Internet Explorer cotains an unspecified vulnerability that allows remote attackers to gain privileges via a crafted web site.
What this vulnerability means in practice
CVE-2014-2817 is a privilege escalation issue in Microsoft Internet Explorer, so the danger is not just initial execution in a browser tab, but the possibility of turning a web interaction into higher system rights. In practice, that kind of flaw can be used to cross from user-level activity into a more powerful security context.
Because CISA added it to the Known Exploited Vulnerabilities catalogue, organisations should treat it as an exposure that has been used in the wild rather than as a purely theoretical browser bug. For authoritative patch and version detail, readers should rely on the CVE Program record and the National Vulnerability Database entry instead of secondary summaries.
How exploitation typically matters
A privilege escalation in a browser matters because browsers sit on a boundary between external content and local trust. If an attacker can trigger the flaw through a crafted website, they may use a normal browsing session to obtain stronger permissions, reach local data, or chain into broader compromise after the first foothold.
The main security consequence is that a seemingly ordinary web visit can become an execution path into the host. That changes the risk profile from simple malicious content to a stepping stone for follow-on actions, including persistence, credential access, or lateral movement if the same system is trusted elsewhere in the environment.
For attack-pattern context, the MITRE ATT&CK Enterprise Matrix is useful because it maps how attackers combine browser exploitation with privilege escalation and subsequent post-exploitation activity.
Exposure and remediation priorities
To check exposure, organisations should first confirm where Microsoft Internet Explorer is still present, whether it is enabled on supported endpoints, and whether those systems are reachable by users who browse untrusted sites. Internet-facing workstations, legacy line-of-business desktops and shared systems deserve particular attention because they increase the chance that a crafted webpage can be delivered to a vulnerable host.
If patching is delayed, compensating controls should reduce the attack path, not merely document the risk. That means limiting access to untrusted web content, reducing browser exposure on high-value systems, and ensuring the vulnerable browser is not available where it is operationally unnecessary. The broader vulnerability-management process should also prioritise known exploited items ahead of less urgent findings, which is why the Vulnerability Management Guide is relevant for triage, KEV prioritisation and verification.
For broader defensive context, the NIST Cybersecurity Framework 2.0 supports exposure management through identify, protect, detect and recover activities, while the NIST SP 800-53 Rev 5 Security and Privacy Controls gives concrete control coverage for configuration management, access control and monitoring.
Detection and compromise review
After exploitation is suspected or confirmed, response should focus on whether the browser flaw was used as an entry point and what changed on the system afterwards. That means reviewing endpoint telemetry, browser activity, suspicious child processes, unexpected privilege changes and any signs that the attacker used the browser compromise to stage additional tooling or access other resources.
Post-patch review matters because fixing the software does not prove the host stayed clean. If the vulnerability was exploited before remediation, organisations should check for persistence, unusual local accounts, modified settings, new scheduled tasks, suspicious downloads and any signs that sensitive data or credentials were accessed during the incident window.
Risk and Threat Considerations
This vulnerability is dangerous because it combines web delivery with privilege gain, which is a strong pattern for real-world exploitation. A browser-based privilege escalation can turn routine user activity into a higher-impact compromise, especially when the affected system has broad local access or is used to reach sensitive internal services.
Failure mechanism: An attacker delivers or lures a victim to a crafted website, triggers the Internet Explorer flaw, and uses the resulting privilege gain to move beyond the original browser context.
Impact: The attacker may gain stronger local control, establish persistence, access protected data, or build a launch point for broader intrusion and lateral movement.
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 governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | CM-2 — Baseline Configuration | Browser exposure depends on managed endpoint baselines and removal of unnecessary legacy software. |
| SI-2 — Flaw Remediation | This KEV-listed browser flaw requires timely vulnerability remediation and verification. | |
| SI-4 — System Monitoring | Exploitation review depends on detecting suspicious post-compromise behaviour on affected hosts. | |
| Recommendation — Remove or disable legacy browser exposure through managed configuration baselines. Prioritise remediation and verify that the browser flaw is eliminated across in-scope endpoints. Monitor affected endpoints for signs of exploitation, privilege changes and post-breach activity. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Known exploited vulnerabilities demand prioritised discovery, triage and remediation. |
| Recommendation — Prioritise, remediate and verify this exploited browser vulnerability across the estate. | ||
Practitioner Guidance
Why practitioners should care: Treat known exploited browser privilege-escalation flaws as urgent exposure-reduction items, not routine cleanup. The key operational question is whether the vulnerable browser still exists on systems that can reach untrusted content and whether those systems carry business-critical access.
What to watch for: Focus on endpoint systems that still expose legacy browser components, users who browse externally from privileged workstations, and any incident signals that suggest a browser session was used to elevate privileges. The value lies in combining asset visibility with post-event compromise review, not in assuming patching alone resolves the risk.
Related resources from NHI Mgmt Group
- CVE-2014-4123 (Microsoft Internet Explorer Privilege Escalation)
- CVE-2014-1812 (Microsoft Windows Group Policy Preferences Password Privilege Escalation)
- CVE-2019-1388 (Microsoft Windows Certificate Dialog Privilege Escalation)
- CVE-2021-31199 (Microsoft Enhanced Cryptographic Provider Privilege Escalation)