CVE-2021-42292

VendormicrosoftProduct365 apps, office 2016, office 2019, office 2021, excel, office, office long term servicing channelDiscoveredNov 10, 2021UpdatedAug 19, 2026

Microsoft Excel Security Feature Bypass Vulnerability

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CVSS v3.1

7.8 HIGH

EPSS

43.0%

probability of exploitation in 30 days

CISA KEV

Listed

confirmed active exploitation

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Aug 16, 2026 → Aug 26, 2026

▲ 11.1pp

31.9% → 43.0% over 3 tracked changes

CVSS v3.1 Detail

Attack VectorLOCAL

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityHIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Connections

7 relationships

office long term servicing channel

source

Timeline

disclosure → media coverage

Nov 10, 2021

Disclosure — published as a CVE record. · last revised by NVD Aug 19, 2026

Public PoC (1)

github.com/corelight/CVE-2021-42292

Unverified third-party code — review before executing.