# CVE-2020-0688: Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

> CVE-2020-0688: Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-0688
Last updated: 2025-10-21T23:35:51Z

- Published: 2020-02-11 21:22 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: microsoft
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Known

## Description

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30
- Microsoft: Microsoft Exchange Server 2013
- Microsoft: Microsoft Exchange Server 2016 Cumulative Update 14
- Microsoft: Microsoft Exchange Server 2016 Cumulative Update 15
- Microsoft: Microsoft Exchange Server 2019 Cumulative Update 3
- Microsoft: Microsoft Exchange Server 2019 Cumulative Update 4

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-0688)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-0688)
- [http://packetstormsecurity.com/files/156592/Microsoft-Exchange-2019-15.2.221.12-Remote-Code-Execution.html](http://packetstormsecurity.com/files/156592/Microsoft-Exchange-2019-15.2.221.12-Remote-Code-Execution.html)
- [http://packetstormsecurity.com/files/156620/Exchange-Control-Panel-Viewstate-Deserialization.html](http://packetstormsecurity.com/files/156620/Exchange-Control-Panel-Viewstate-Deserialization.html)
- [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688)
- [https://www.zerodayinitiative.com/advisories/ZDI-20-258/](https://www.zerodayinitiative.com/advisories/ZDI-20-258/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-0688 · Markdown: https://rewindex.com/cve/CVE-2020-0688.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-0688 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:03:32.312Z