CVE-2021-43256
Microsoft Excel Remote Code Execution Vulnerability
7.8 High
Microsoft Excel Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
2.18%Up 1.3 points since Dec 16, 2021
What each source reports
CVE List Score used
Microsoft Excel Remote Code Execution Vulnerability
Microsoft Excel Remote Code Execution Vulnerability
- Record
CVE-2021-43256- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-30200
Microsoft Excel Remote Code Execution Vulnerability
- Record
EUVD-2021-30200- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xf9j-qfgm-f8jm
Microsoft Excel Remote Code Execution Vulnerability
Microsoft Excel Remote Code Execution Vulnerability
- Record
GHSA-xf9j-qfgm-f8jm- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
Microsoft Excel Remote Code Execution Vulnerability
- Record
CVE-2021-43256- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
Affected products
- microsoft excel
- microsoft 365 apps
- microsoft excel rt
- microsoft 365 apps for enterprise
- microsoft excel 2013 service pack 1
- microsoft excel 2016
- microsoft office 2019
- microsoft office ltsc 2021
- microsoft office web apps server 2013 service pack 1
- microsoft office
- microsoft office online server
- microsoft office long term servicing channel
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History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43256 is a high vulnerability (CVSS 7.8) in Microsoft Excel, published December 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.18%, the 82nd percentile. No source names a fixed version.