What is CVE-2013-3893?

CVE-2013-3893 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Use After Free. CVSS score: 8.8/10. Published 2013-09-18.

How severe is CVE-2013-3893?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2013-3893 known to be exploited?

Yes. CVE-2013-3893 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-08-12), indicating it is being actively exploited. 31 public proof-of-concept repositories are indexed.

Use After Free in Microsoft Internet Explorer

CVE-2013-3893

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.

Vulnerability class: Use-After-Free

Published 2013-09-18 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.875 (99.8th percentile), scored 2026-10-15.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.858 · newest: 0.875 · change: +0.017

Affected products

Microsoft Internet Explorer — versions 6, 7, 8

Weakness classification (CWE)

CWE-416 — Use After Free

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-08-12. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-09-02.

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.

Public proof-of-concept exploits

References

jvndb.jvn.jp/ja/contents/2013/JVNDB-2013-000093.html (Third Party Advisory, third-party-advisory)
jvn.jp/en/jp/JVN27443259/index.html (Third Party Advisory, third-party-advisory)
blogs.technet.com/b/srd/archive/2013/10/08/ms13-080-addresses-two-vulnerabiliti… (Vendor Advisory)
www.securityfocus.com/bid/62453 (vdb-entry, Broken Link)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:18665 (Broken Link, signature, vdb-entry)
www.us-cert.gov/ncas/alerts/TA13-288A (US Government Resource, third-party-advisory)
technet.microsoft.com/security/advisory/2887505 (Vendor Advisory)
docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-080 (vendor-advisory, Vendor Advisory)
pastebin.com/raw.php (Exploit)
blogs.technet.com/b/srd/archive/2013/09/17/cve-2013-3893-fix-it-workaround-avai… (Exploit)

Frequently asked questions

What is CVE-2013-3893?: CVE-2013-3893 is a high-severity vulnerability in Microsoft Internet Explorer, classified under Use After Free. CVSS score: 8.8/10. Published 2013-09-18.
How severe is CVE-2013-3893?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2013-3893 known to be exploited?: Yes. CVE-2013-3893 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-08-12), indicating it is being actively exploited. 31 public proof-of-concept repositories are indexed.