# CVE-2018-8151: Microsoft Exchange Memory Corruption Vulnerability

CVE-2018-8151 is fixed in 6 products on 1 platform, first by KB4091243, released May 8, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-8151
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0870
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: May 8, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8151

## Description

<p>An information disclosure vulnerability exists when Microsoft Exchange improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the remote system.</p> <p>To exploit the vulnerability, an attacker would send a specially-crafted email to an affected Exchange Server.</p> <p>The security update addresses the vulnerability by modifying how Microsoft Exchange handles objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 21 |  | [KB4091243](https://patchblox.com/security/data/fix/microsoft/kb4091243.md) | May 8, 2018 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 19 |  | [KB4092041](https://patchblox.com/security/data/fix/microsoft/kb4092041.md) | May 8, 2018 |
| Microsoft | Microsoft Exchange Server 2013 Cumulative Update 20 |  | [KB4092041](https://patchblox.com/security/data/fix/microsoft/kb4092041.md) | May 8, 2018 |
| Microsoft | Microsoft Exchange Server 2013 Service Pack 1 |  | [KB4092041](https://patchblox.com/security/data/fix/microsoft/kb4092041.md) | May 8, 2018 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 8 |  | [KB4092041](https://patchblox.com/security/data/fix/microsoft/kb4092041.md) | May 8, 2018 |
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 9 |  | [KB4092041](https://patchblox.com/security/data/fix/microsoft/kb4092041.md) | May 8, 2018 |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo