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CVE-2021-27085: Microsoft Internet Explorer Remote Code Execution Vulnerability

criticalknown exploitedCVE-2021-27085
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft Internet Explorer contains an unspecified vulnerability that allows for remote code execution.

CSIRTS triage

vendor: Microsoftproduct: Internet ExplorerRemote code execution
What
An unspecified vulnerability allows for remote code execution.
Who is affected
Users of Microsoft Internet Explorer.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
Action
Install the latest security updates for Internet Explorer.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-27085

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-27085coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Internet Explorer

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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