Threats / Microsoft / CVE-2013-3163
CVE-2013-3163
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Internet Explorer vulnerability
Microsoft Internet Explorer memory corruption vulnerability allows remote code execution via crafted websites. Exploited in the wild with high EPSS score.
Verdict
Today item — known-exploited.
Remote attackers can execute arbitrary code on vulnerable Internet Explorer instances through malicious web content, leading to system compromise. Denial of service is also possible. Active exploitation in the wild increases risk.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
2 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 2023-03-30).
Probability (EPSS)
EPSS 0.70676 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Internet Explorer. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-94 Code Injection — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
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 malicious website containing code that triggers memory corruption in Internet Explorer's rendering engine.
Business
Users visiting the attacker's site or a compromised legitimate site face immediate risk of system takeover.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the memory corruption to break out of the browser sandbox and execute arbitrary code with user privileges.
Business
Attackers gain ability to steal credentials, install malware, or pivot to internal networks from compromised endpoints.
3
Lateral reach — past segmentation narrative 3
Attacker
I distribute the exploit through drive-by downloads or watering hole attacks targeting enterprise users.
Business
Organizations face widespread endpoint compromise, data exfiltration, and potential business disruption at scale.
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