CVE-2025-21354 — Microsoft Excel RCE¶
Key facts
CVE-2025-21354 is a Critical vulnerability: Microsoft Excel RCE. This entry ships a detection-only PoC.
| CVE | CVE-2025-21354 |
| Severity | Critical |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2025/CVE-2025-21354/ |
Details¶
Overview¶
Heap corruption leading to RCE
Vulnerability Details¶
- CVE ID: CVE-2025-21354
- CVSS Score: 9.8 (Critical)
- Type: RCE
- Product: Microsoft Excel
Affected Products¶
- Microsoft Excel (specific versions - check vendor advisory)
Proof of Concept¶
Usage¶
Mitigation¶
- Apply vendor patches immediately
- Implement network segmentation
- Monitor for exploitation attempts
- Review access controls
References¶
Disclaimer¶
This PoC is for authorized security testing only.
Frequently asked questions¶
What is CVE-2025-21354?¶
CVE-2025-21354 is a Critical vulnerability: Microsoft Excel RCE. This entry ships a detection-only PoC.
How do I detect CVE-2025-21354?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2025-21354?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.