---
title: "CVE-2013-3893: Microsoft Internet Explorer Resource Management Errors Vulnerability"
url: https://erroneo.us/security/cve/CVE-2013-3893/
description: "CVE-2013-3893 (Microsoft Internet Explorer): Exploited in the wild (CISA KEV). Use-after-free vulnerability in the SetMouseCapture implementation in…"
type: vulnerability-record
section: "Security Digest"
date_published: 2013-09-18
date_modified: 2025-10-22
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2013-3893"
kev: true
cvss: 8.8
epss: 0.87639
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2013-3893: Microsoft Internet Explorer Resource Management Errors Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Internet Explorer. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-08-12, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-09-02 ; treat that as the outer limit, not the target.
- EPSS 87.6% , percentile 99.8: FIRST’s model estimates a 87.6% chance of exploitation activity in the next 30 days, higher than 99.8% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## What it is

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 (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-08-12; federal due date 2025-09-02. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 87.64% probability of exploitation activity in the next 30 days; percentile 99.8.

## Sources

- [MS13-080](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-080)
- [Listed in CISA KEV notes (learn.microsoft.com)](https://learn.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-080)
- [CVE.org record CVE-2013-3893](https://www.cve.org/CVERecord?id=CVE-2013-3893)
- [NVD entry CVE-2013-3893](https://nvd.nist.gov/vuln/detail/CVE-2013-3893)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2013-3893)
- [JVNDB-2013-000093](http://jvndb.jvn.jp/ja/contents/2013/JVNDB-2013-000093.html)
- [JVN#27443259](http://jvn.jp/en/jp/JVN27443259/index.html)
- [blogs.technet.com](http://blogs.technet.com/b/srd/archive/2013/10/08/ms13-080-addresses-two-vulnerabilities-under-limited-targeted-attacks.aspx)
- [62453](http://www.securityfocus.com/bid/62453)
- [oval:org.mitre.oval:def:18665](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18665)
- [TA13-288A](http://www.us-cert.gov/ncas/alerts/TA13-288A)
- [technet.microsoft.com](http://technet.microsoft.com/security/advisory/2887505)
- [pastebin.com](http://pastebin.com/raw.php?i=Hx1L5gu6)
- [blogs.technet.com](http://blogs.technet.com/b/srd/archive/2013/09/17/cve-2013-3893-fix-it-workaround-available.aspx)
- [packetstormsecurity.com](http://packetstormsecurity.com/files/162585/Microsoft-Internet-Explorer-8-SetMouseCapture-Use-After-Free.html)

---
Source page: https://erroneo.us/security/cve/CVE-2013-3893/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt