Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6 through 11 allows remote a
Affects Internet Explorer 6 through 11 on Windows clients; Windows Server installs using the Server Core option are not affected. Fixed by security updates 2879017 and 2884101.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 2879017, 2884101
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Microsoft Internet Explorer is affected by this vulnerability, which is a memory flaw in its mshtml.dll component. A remote attacker could exploit it through specially crafted JavaScript to run arbitrary code on the affected system.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- n/a n/a
Version range not reported
References 11
jvndb.jvn.jp
blogs.technet.com
securityfocus.com
oval.cisecurity.org
us-cert.gov
technet.microsoft.com
docs.microsoft.com
pastebin.com
packetstormsecurity.com
Questions about CVE-2013-3893
What does this mean?
A use-after-free flaw in the SetMouseCapture code of mshtml.dll can allow remote code execution with the same user rights as the current user.Source: learn.microsoft.com
Am I affected, and how do I check?
Internet Explorer 6 through 11 on Windows clients are affected. Supported Windows Server 2008, 2008 R2, 2012, and 2012 R2 editions are not affected, including Server Core installs. Check the Internet Explorer version and whether the machine runs a Windows client or Windows Server edition.Source: learn.microsoft.com
What should I do about it?
Install the cumulative security update: 2879017 for supported Internet Explorer versions except 11, and 2884101 for Internet Explorer 11 on Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2.Source: learn.microsoft.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-08-12, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data