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WatchlistCritical

CVE-2018-8154Exchange Server Out-of-Bounds Write

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." This affects Microsoft Exchange Server.

Published May 9, 2018 · Updated Nov 21, 2024

Key Facts

Patch in the next maintenance window
  • CVE-2018-8154 is a critical-severity vulnerability (CVSS 9.8 v3) affecting Exchange Server (Microsoft).
  • It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
  • EPSS estimates a 24% probability of exploitation in the next 30 days.
  • No fixed version is listed yet; check the vendor advisory for mitigations.
  • Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.

Scores

CVSS v3

9.8

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

24%

Higher than 97.7% of all scored CVEs

Exploit maturity

None known

ATLAS score

36/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

None known

Public exploit code

0

Proof-of-concept links

In-the-wild evidence

0

Reports of active use

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." This affects Microsoft Exchange Server. This CVE ID is unique from CVE-2018-8151.

Affected Products

7 affected entries in total
ProductAffected versionsFixed in
Exchange ServerMicrosoft2010-sp3, 2013-cumulative_update_19, 2013-cumulative_update_20, 2013-sp1, 2016-cumulative_update_8, 2016-cumulative_update_9, >= 2010 Service Pack 3 Update Rollup 21n/a

Timeline

  1. Publicly disclosed

    May 9, 2018

  2. Last updated

    Nov 21, 2024

Weakness Type

  • CWE-787 Out-of-bounds Write

FAQ

Common Questions.

Is CVE-2018-8154 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.

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Figures as of Oct 20, 2026. Compiled by Brandefense technologies from public vulnerability catalogs; scoring as described in How it works.

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