Threats / Microsoft / CVE-2021-27085
CVE-2021-27085
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Internet Explorer vulnerability
Microsoft Internet Explorer contains an unspecified remote code execution vulnerability that has been exploited in the wild.
Verdict
Today item — known-exploited.
This vulnerability poses a significant risk due to active exploitation in the wild. The remote code execution capability allows attackers to compromise systems through Internet Explorer, a widely deployed browser in enterprise environments.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
3 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 0.03708 — 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.
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 webpage or email attachment that triggers the unspecified vulnerability when opened in Internet Explorer.
Business
End users are compromised through routine browsing or email interaction, establishing initial system access for the attacker.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary code with the privileges of the Internet Explorer process on the victim's system.
Business
Attackers gain execution capability within the user's security context, enabling lateral movement and data exfiltration.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistence or escalate privileges to gain deeper system control.
Business
Organizations face potential compromise of sensitive data, system integrity violations, and operational disruption across affected endpoints.
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