Threats / Microsoft / CVE-2013-3918
CVE-2013-3918
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows InformationCardSigninHelper ActiveX control (icardie.dll) contains an out-of-bounds write vulnerability allowing remote code execution when a user visits a specially crafted webpage.
Verdict
Today item — known-exploited.
An attacker can achieve remote code execution with user-level privileges by hosting a malicious webpage that exploits an out-of-bounds write flaw in the ActiveX control. The vulnerability requires user interaction and affects end-of-life Windows versions.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
5 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-10-06).
Probability (EPSS)
EPSS 0.73872 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a webpage containing malicious content that triggers the out-of-bounds write in the InformationCardSigninHelper ActiveX control.
Business
Attackers gain a reliable vector for distributing malware and establishing persistent access to user systems at scale.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I host the webpage on an attacker-controlled or compromised domain and distribute the link via phishing or watering hole attacks.
Business
Organizations face increased risk of targeted compromise against users who visit untrusted or compromised websites.
3
Lateral reach — past segmentation narrative 3
Attacker
When a user visits the webpage, the vulnerability executes arbitrary code with the privileges of the logged-in user.
Business
Confidential data, intellectual property, and system integrity are compromised within the user's security context.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05