# KB4536989: February 2020 security update

KB4536989, released February 11, 2020, fixes 1 CVE in Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30. One of them is being exploited (CVE-2020-0688); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4536989
- Platform: Microsoft
- Released: Feb 11, 2020
- Priority: Patch now (Closes CVE-2020-0688, exploited (CISA KEV, ransomware))
- CVEs: 1, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/4536989

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2010-service-pack-3-update-rollup-30.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-0688](https://patchblox.com/security/data/cve/CVE-2020-0688.md) | Patch now | Microsoft Exchange Server | n/a | 0.9996 | CISA KEV, Ransomware |

---

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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.