CVE-2019-25564Public exploit

Application crash via oversized Group value

Published Mar 21, 2026 · Updated Mar 21, 2026

Out-of-bounds write in PCHelpWareV2 1.0.0.5 allows local users to crash the Viewer through an oversized Group value. The Group property accepts a 100-character payload and writes beyond its intended buffer when Ok is selected. The attacker needs interactive access to the Windows Viewer and must paste the payload into Properties; the demonstrated result is an application crash only.

CVSS severity6.8
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in PCHelpWareV2 1.0.0.5 allows local users to crash the Viewer through an oversized Group value. The Group property accepts a 100-character payload and writes beyond its intended buffer when Ok is selected. The attacker needs interactive access to the Windows Viewer and must paste the payload into Properties; the demonstrated result is an application crash only.

The record

CVE
CVE-2019-25564
Published
Mar 21, 2026
Updated
Mar 21, 2026
Vendor
UltraVNC Team
Product
PCHelpWareV2
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

UltraVNC Team · PCHelpWareV2version=1.0.0.5

Published CVSS scores

6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
5.5VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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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