CVE-2023-42757Public exploit

Process-monitor crash via oversized PID suffix concatenation

Published May 7, 2024 · Updated Mar 26, 2025

Denial of service in Microsoft Process Explorer before 17.04 allows local users to crash the application via a crafted process name. Process Explorer copies the executable name into a 256-character buffer, then appends the PID with wcscat_s; an overlength result invokes the default invalid-parameter handler and closes the application. A local user able to launch a process through NtCreateUserProcess can keep Process Explorer unavailable to all users, including administrators, while that process runs.

CVSS severity4.2
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Microsoft Process Explorer before 17.04 allows local users to crash the application via a crafted process name. Process Explorer copies the executable name into a 256-character buffer, then appends the PID with wcscat_s; an overlength result invokes the default invalid-parameter handler and closes the application. A local user able to launch a process through NtCreateUserProcess can keep Process Explorer unavailable to all users, including administrators, while that process runs.

The record

CVE
CVE-2023-42757
Published
May 7, 2024
Updated
Mar 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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