CVE-2025-21354 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Microsoft Excel Remote Code Execution Vulnerability. EPSS estimates a 0.94% chance of exploitation in the next 30 days.

## Description

Microsoft Excel Remote Code Execution Vulnerability

## Metrics

CVSS 3.1 7.8/10

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

EPSS Probability 0.94%

56.5th percentile

Probability of exploitation in the next 30 days. [Learn more](https://www.first.org/epss/)

## Weakness Enumeration

- [CWE-822](https://cwe.mitre.org/data/definitions/822.html)

## Affected Software

| Vendor | Product | Versions |
| --- | --- | --- |
| Microsoft | 365 Apps | All versions |
| Microsoft | Office | 2019 |
| Microsoft | Office Long Term Servicing Channel | 2021 |
| Microsoft | Office Long Term Servicing Channel | 2024 |
| Microsoft | Office Online Server | < 16.0.10416.20047 |

## References

- [Patch, Vendor Advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21354)

## Timeline

Published Jan 14, 2025

Last Modified Jun 17, 2026

Status Analyzed

## Frequently Asked Questions

**What is CVE-2025-21354?**  
Microsoft Excel Remote Code Execution Vulnerability

**How severe is CVE-2025-21354?**  
CVE-2025-21354 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.

**How do I fix CVE-2025-21354?**  
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also [run a Strix scan](https://app.strix.ai/) to test if your systems are affected.