# CVE-2020-17123: Microsoft Excel Remote Code Execution Vulnerability

CVE-2020-17123 is fixed in 9 products on 1 platform, first by KB4493148, released December 15, 2020. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-17123
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0359
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Dec 15, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-17123

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Excel 2010 Service Pack 2 (32-bit editions) |  | [KB4493148](https://patchblox.com/security/data/fix/microsoft/kb4493148.md) | Dec 15, 2020 |
| Microsoft | Microsoft Excel 2010 Service Pack 2 (64-bit editions) |  | [KB4493148](https://patchblox.com/security/data/fix/microsoft/kb4493148.md) | Dec 15, 2020 |
| Microsoft | Microsoft Excel 2013 RT Service Pack 1 |  | [KB4493139](https://patchblox.com/security/data/fix/microsoft/kb4493139.md) | Dec 15, 2020 |
| Microsoft | Microsoft Excel 2013 Service Pack 1 (32-bit editions) |  | [KB4493139](https://patchblox.com/security/data/fix/microsoft/kb4493139.md) | Dec 15, 2020 |
| Microsoft | Microsoft Excel 2013 Service Pack 1 (64-bit editions) |  | [KB4493139](https://patchblox.com/security/data/fix/microsoft/kb4493139.md) | Dec 15, 2020 |
| Microsoft | Microsoft Excel 2016 (32-bit edition) |  | [KB4486754](https://patchblox.com/security/data/fix/microsoft/kb4486754.md) | Dec 15, 2020 |
| Microsoft | Microsoft Excel 2016 (64-bit edition) |  | [KB4486754](https://patchblox.com/security/data/fix/microsoft/kb4486754.md) | Dec 15, 2020 |
| Microsoft | Microsoft Office Web Apps 2013 Service Pack 1 |  | [KB4486760](https://patchblox.com/security/data/fix/microsoft/kb4486760.md) | Dec 15, 2020 |
| Microsoft | Office Online Server |  | [KB4486750](https://patchblox.com/security/data/fix/microsoft/kb4486750.md) | Dec 15, 2020 |

---

Data as of 2026-11-08T19:12:23Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.