Threats / Microsoft / CVE-2020-1380
CVE-2020-1380
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Internet Explorer vulnerability
Microsoft Internet Explorer memory corruption vulnerability enabling remote code execution with high exploitation prevalence in the wild.
Verdict
Today item — known-exploited.
Out-of-bounds write flaw in Internet Explorer permits remote code execution when processing malicious content. Active exploitation observed. Affects users browsing untrusted websites or opening crafted documents.
01
Is it exploitable?
— the evidence, ranked above the scoreReported 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 2021-11-03).
Probability (EPSS)
EPSS 0.24188 — 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-787 Out-of-bounds Write — weakness family: Memory safety.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
Craft malicious webpage or document triggering memory corruption in Internet Explorer rendering engine
Business
User endpoint compromised with attacker code execution at user privilege level
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Execute arbitrary code within browser context to establish persistence or lateral movement
Business
Corporate network access compromised; data exfiltration and malware deployment risk
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