CVE-2013-3897 is an use-after-free vulnerability in Microsoft Internet Explorer. CISA added it to the Known Exploited Vulnerabilities catalogue on 3 March 2022, which means attackers have used it in real attacks. A use-after-free vulnerability exists within CDisplayPointer in Microsoft Internet Explorer that allows an attacker to remotely execute arbitrary code.
What the vulnerability class means in Internet Explorer
A use-after-free in a browser means code keeps using memory after it has been released, so an attacker can try to shape what gets read or executed next. In Internet Explorer, that kind of memory-safety failure is dangerous because browser content is already an untrusted input surface and arbitrary code execution can follow from a successful exploit.
For CVE-2013-3897, the important point is not just that the bug exists, but that it affects a widely exposed client application that processes remote content. Even when the vulnerable condition sits inside a specific component, the security consequence is broader: a webpage, script, or other crafted content can become a delivery mechanism for code execution if the flaw is triggered reliably.
Why this kind of flaw is dangerous
Use-after-free bugs are prized by attackers because they can sometimes be turned into deterministic control over program flow rather than a simple crash. That makes them suitable for exploitation chains that begin with ordinary browsing and end with malware delivery, credential theft, or further system compromise.
Browser exploitation is especially serious because the initial access path is remote and often low-friction. A victim may only need to visit a malicious or compromised page, which means the vulnerability can be used as an initial foothold rather than a standalone outcome.
For authoritative record details, readers should consult the CVE Program entry for the identifier and the NIST National Vulnerability Database record for the canonical vulnerability listing.
How organisations assess exposure and reduce risk
Exposure starts with knowing where the product still exists in the estate, whether it is enabled for normal browsing, and whether it is reachable from users who can receive hostile content. Inventory alone is not enough, because a dormant installation, legacy compatibility mode, or unmanaged endpoint can still preserve a viable attack path.
When a patch is not immediately possible, organisations usually reduce risk by removing unnecessary browser exposure, constraining access to legacy systems, limiting interactive browsing on high-value endpoints, and applying compensating controls around content filtering and sandboxing. The goal is to shrink the number of systems that can be used as a first-stage compromise vector.
Asset scope, KEV-driven prioritisation, and remediation verification are the right operational lens for this class of issue, which is why Vulnerability Management Guide is the most directly relevant NHIMG reference for exposure checking and remediation workflow.
Detection, post-patch review, and identity impact
Detection should look for signs that the browser was used as an initial execution path, not only for the vulnerability itself. Suspicious child processes, unexpected script activity, abnormal downloads, and other post-exploitation behaviour may indicate that exploitation succeeded even if the browser crash was not obvious to users.
After patching, organisations should review endpoints for persistence, malicious changes, and any follow-on access that may have occurred before remediation. If exploitation is suspected, rotate credentials, invalidate active sessions where appropriate, and assess whether service or user accounts were exposed during the compromise chain.
The memory-safety root cause matters, but the real operational impact is often downstream: one browser exploit can become a gateway into broader environment access, so compromised credentials and sessions should be treated as part of the incident review.
Risk and Threat Considerations
This vulnerability class is attractive because it combines remote reach with a potential path to code execution on the victim system. In practice, the main risk is not only the exploit itself but the trust boundary collapse that follows when a browsing session becomes a launch point for deeper compromise.
Failure mechanism: The browser frees memory that later code still expects to exist, and an attacker leverages that stale reference to influence program behaviour or redirect execution.
Impact: Successful exploitation can enable arbitrary code execution, user-level compromise, and subsequent staging for persistence, credential theft, or lateral movement.
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 CIS Controls v8 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| MITRE ATT&CK | T1203 — Exploitation for Client Execution | Browser use-after-free enables remote content to trigger code execution on a client. |
| Recommendation — Map browser exploit telemetry to T1203 and hunt for malicious content delivery and execution chains. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | KEV-listed browser flaws require prioritised discovery, remediation, and verification. |
| Recommendation — Prioritise exposed Internet Explorer systems, remediate the KEV item, and verify closure. | ||
| NIST SP 800-53 Rev 5 | SI-16 — Memory Protection | Use-after-free is a memory-safety failure that this control family addresses through runtime protections. |
| SI-3 — Malicious Code Protection | Browser-delivered exploitation often leads to malicious code execution and post-exploit payloads. | |
| RA-5 — Vulnerability Monitoring and Scanning | Exposure assessment depends on identifying affected assets and tracking exploited vulnerabilities. | |
| Recommendation — Apply memory-protection safeguards to reduce exploitability of use-after-free conditions. Use malicious code protection to block payload delivery and execution after browser exploitation. Continuously identify vulnerable systems and confirm remediation for the exploited browser flaw. | ||
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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