Is CVE-2021-28456 in the CISA KEV catalog?

No. CVE-2021-28456 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-28456?

CVE-2021-28456 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-28456?

CVE-2021-28456 has an EPSS score of 3.69% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-28456?

Install KB3017810 for Microsoft Excel 2010 Service Pack 2. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-28456

MEDIUMEPSS 88th pctl

5.5

CVSS v3

NVD

Description

Microsoft Excel Information Disclosure Vulnerability

How to fix

Remediation Available

Microsoft Excel 2010 Service Pack 2Microsoft

Install:KB3017810Microsoft

Microsoft Excel 2013 RT Service Pack 1Microsoft

Install:KB4504735

Microsoft Excel 2013 Service Pack 1Microsoft

Install:KB4504735Microsoft

Microsoft Excel 2016Microsoft

Install:KB4504721Microsoft

Microsoft Office Online ServerMicrosoft

Install:KB4504714Microsoft

Microsoft Office Web Apps Server 2013 Service Pack 1Microsoft

Install:KB4504729Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

3.69%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.