# CVE-2018-8429: Microsoft Excel Information Disclosure Vulnerability

CVE-2018-8429 is fixed in 9 products on 1 platform, first by KB4227175, released September 11, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-8429
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.1226
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Sep 11, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8429

## Description

<p>An information disclosure vulnerability exists when Microsoft Excel improperly discloses the contents of its memory. An attacker who exploited the vulnerability could access information previously deleted from the active worksheet.</p> <p>To exploit the vulnerability, an attacker could craft a special document file and then convince the user to open it.</p> <p>The update addresses the vulnerability by changing the way certain Excel functions handle objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Excel 2010 Service Pack 2 (32-bit editions) |  | [KB4227175](https://patchblox.com/security/data/fix/microsoft/kb4227175.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel 2010 Service Pack 2 (64-bit editions) |  | [KB4227175](https://patchblox.com/security/data/fix/microsoft/kb4227175.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel 2013 RT Service Pack 1 |  | [KB4092479](https://patchblox.com/security/data/fix/microsoft/kb4092479.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel 2013 Service Pack 1 (32-bit editions) |  | [KB4092479](https://patchblox.com/security/data/fix/microsoft/kb4092479.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel 2013 Service Pack 1 (64-bit editions) |  | [KB4092479](https://patchblox.com/security/data/fix/microsoft/kb4092479.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel 2016 (32-bit edition) |  | [KB4092460](https://patchblox.com/security/data/fix/microsoft/kb4092460.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel 2016 (64-bit edition) |  | [KB4092460](https://patchblox.com/security/data/fix/microsoft/kb4092460.md) | Sep 11, 2018 |
| Microsoft | Microsoft Excel Viewer 2007 Service Pack 3 |  | [KB4092467](https://patchblox.com/security/data/fix/microsoft/kb4092467.md) | Sep 11, 2018 |
| Microsoft | Microsoft Office Compatibility Pack Service Pack 3 |  | [KB4092466](https://patchblox.com/security/data/fix/microsoft/kb4092466.md) | Sep 11, 2018 |

---

Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo