CVE-2019-25627Public exploit

Local code execution via Stream Name overflow

Published Mar 24, 2026 · Updated Mar 24, 2026

Stack buffer overflow in the FlexHEX 2.71 Stream Name field allows local users to execute arbitrary code through pasted Unicode input. The dialog accepts an overlong Unicode string without an effective length bound, overwriting next-SEH and SEH handler records so an exception redirects control to embedded shellcode. Exploitation requires local GUI access and a manual paste into New Stream; the published proof of concept executes code in the FlexHEX process context on Windows XP SP3.

CVSS severity8.6
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in the FlexHEX 2.71 Stream Name field allows local users to execute arbitrary code through pasted Unicode input. The dialog accepts an overlong Unicode string without an effective length bound, overwriting next-SEH and SEH handler records so an exception redirects control to embedded shellcode. Exploitation requires local GUI access and a manual paste into New Stream; the published proof of concept executes code in the FlexHEX process context on Windows XP SP3.

The record

CVE
CVE-2019-25627
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Heaventools Software
Product
FlexHEX
Classifications
CWE-434, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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=2.71

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Heaventools Software · FlexHEXversion=2.71

Published CVSS scores

8.4VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1203Exploitation for Client Execution

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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