Threats / Microsoft / CVE-2013-3893
CVE-2013-3893
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Microsoft Internet Explorer vulnerability
Microsoft Internet Explorer memory corruption vulnerability enabling remote code execution. Actively exploited in the wild with high exploitation likelihood.
Verdict
Today item — known-exploited.
Memory corruption flaw in Internet Explorer allows unauthenticated remote attackers to execute arbitrary code through crafted content. Active exploitation observed. Affected versions are end-of-life; immediate discontinuation recommended.
CISA KEV Yes · 2025-08-124EPSS 0.8593 (verify live)5Exploit Public PoC6CVSS 8.8 (CISA)3CISA SSVC Exploitation: active · Automatable: no · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
8 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 2025-08-12).
Probability (EPSS)
EPSS 0.8593 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) · Affected: Microsoft, Internet Explorer. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-399 Resource Management Errors — weakness family: Resource / availability.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 4346 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
Public exploit available
Public exploit tooling is catalogued for this CVE (a functional/weaponized public exploit). Catalog entries: Metasploit module. We link the catalog page(s) only — no payload or code is hosted or restated here.Link, never host — the catalog page is the source; basicsecurity.net does not redistribute payloads.
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 malicious web content designed to trigger memory corruption in Internet Explorer's rendering engine.
Business
Users visiting attacker-controlled or compromised websites face arbitrary code execution on their systems without authentication or user interaction.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I deliver the exploit payload through email attachments, drive-by downloads, or watering hole attacks targeting organizations still using legacy Internet Explorer.
Business
Compromised endpoints become entry points for lateral movement, data exfiltration, and persistent network compromise across enterprise infrastructure.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish command and control access on victim machines to deploy secondary payloads or maintain persistence.
Business
Organizations face operational disruption, regulatory compliance violations, and incident response costs while managing widespread system compromise.
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