How severe is CVE-2013-3893?

CVE-2013-3893 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which products are affected by CVE-2013-3893?

Affected package information for CVE-2013-3893 is not yet fully mapped. Check the official advisory links for details.

How do I patch CVE-2013-3893?

No patch has shipped for CVE-2013-3893 yet — track the microsoft internet explorer advisory for a fixed release and apply the workarounds below in the meantime.

How do I detect CVE-2013-3893 across my infrastructure?

Inventory every microsoft internet explorer deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

How do I mitigate CVE-2013-3893 if there is no patch (or I can't update yet)?

Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

How does O3 Security protect against CVE-2013-3893?

O3 detects and blocks CVE-2013-3893 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Is CVE-2013-3893 actively exploited in the wild?

Yes. There are 5 known exploit references for CVE-2013-3893, including 2 documented proof-of-concept exploits on Exploit-DB and 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2013-3893?

CVE-2013-3893 has an EPSS (Exploit Prediction Scoring System) score of 85.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2013-3893 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2013-3893 (Microsoft Internet Explorer Resource Management Errors Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-08-12. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-09-02. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2013-3893?

CVE-2013-3893 is classified as Use After Free (CWE-416). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2013-3893?

CVE-2013-3893 affects microsoft internet explorer (6 versions, e.g. 6, 7, 8…). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2013-3893?

2 Metasploit modules reference CVE-2013-3893, which lowers the barrier to weaponization. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2013-3893 published, and has it been updated?

CVE-2013-3893 was published on September 18, 2013 and was last updated on June 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-08-12 — agencies required to remediate by 2025-09-02

CVE-2013-3893

HIGH

Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code via crafted…

Published

Sep 18, 2013

Updated

Jun 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

5 known

EPSS Exploitation Probability

via FIRST.org ↗

85.9%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code via crafted JavaScript strings, as demonstrated by use of an ms-help: URL that triggers loading of hxds.dll.

Affected Products

1 product · 7 configurations

Application

internet explorermicrosoft

6 versions

67891011

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-49872localwindows

Microsoft Internet Explorer 8 - 'SetMouseCapture ' Use After Free

by SlidingWindow · May 17, 2021

Exploit-DB Source

EDB-28682remotewindows✓ Verified

Micorosft Internet Explorer - SetMouseCapture Use-After-Free (Metasploit)

by Metasploit · Oct 2, 2013

Exploit-DB Source

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every microsoft internet explorer deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Remediation status
No patch has shipped for CVE-2013-3893 yet — track the microsoft internet explorer advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2013-3893 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2013-3893. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

O3 Security · Runtime Protection

Is CVE-2013-3893 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2013-3893 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

Protect my workloads How runtime protection works

CVE-2013-3893

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

How O3 protects you

Frequently Asked Questions

Is CVE-2013-3893 being exploited in your environment?