CVE-2021-42292: Microsoft Excel Security Feature Bypass

criticalknown exploitedpublic exploitCVE-2021-42292

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.

A security feature bypass vulnerability in Microsoft Excel would allow a local user to perform arbitrary code execution.

CSIRTS triage

vendor: Microsoft product: Excel Authentication bypass Remote code execution

What: The vulnerability allows a local user to bypass security features and execute arbitrary code.
Who is affected: Local users of Microsoft Excel are affected.
Urgency: Immediate action is required due to active exploitation and critical severity.
Action: Install the latest updates for Microsoft Excel.

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: 2021-11-17
Exploitation: Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-42292

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.

Exploitation confirmedCVE-2021-42292Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2021-42292	coverage & exploitation status	NVD · CVE.org

CVE-2021-42292: Microsoft Excel Security Feature Bypass

CSIRTS triage

Details

Exploitation outlook

Referenced CVEs

More from CISA Known Exploited Vulnerabilities