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

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'.

8.8 HIGHEPSS 99.95%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 02:46 UTC

OverviewCVSS details

8.8HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Feb 11, 2020
Assigner: microsoft

Affected

Microsoft Exchange Server 2013 (Microsoft)

Versions: Cumulative Update 23

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Exploitation

Public exploit: Yes · 2 references
CISA KEV: Listed · Nov 3, 2021
KEV due date: May 3, 2022
Ransomware use: Known
SSVC: Exploitation active · Automatable no · Impact total

EPSS · FIRST, scored Nov 7

99.95%chance of exploitation in 30 days

Higher than 99.97% of CVEs

CVSS 3.1 · NVD

8.8High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

9.0High

AV:N/AC:L/Au:S/C:C/I:C/A:C

Attack vector: Network
Attack complexity: Low
Authentication: Single
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
8.8	HIGH	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0	HIGH	2.0NVD	AV:N/AC:L/Au:S/C:C/I:C/A:C

CISA required action

⚡ Known exploited · remediation due May 3, 2022

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Details

CVE ID: CVE-2020-0688
Status: Analyzed
Assigner (CNA): microsoft
Published: Feb 11, 2020
Last modified: 2026-06-17 02:46 UTC
Weaknesses: CWE-287

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:39 UTC.