CVE-2018-25259Public exploitHinoki check available

Local code execution via computer-name SEH overwrite

Published Apr 22, 2026 · Updated Apr 22, 2026

Stack-based buffer overflow in LizardSystems Terminal Services Manager 3.1 allows local users to execute arbitrary code via an imported file. During the add computers wizard, the computer names field accepts an oversized file payload that overwrites the SEH handler pointer and redirects execution to embedded shellcode. Exploitation requires local access to import the crafted file, and the payload runs with the application's privileges.

CVSS severity8.6
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stack-based buffer overflow in LizardSystems Terminal Services Manager 3.1 allows local users to execute arbitrary code via an imported file. During the add computers wizard, the computer names field accepts an oversized file payload that overwrites the SEH handler pointer and redirects execution to embedded shellcode. Exploitation requires local access to import the crafted file, and the payload runs with the application's privileges.

The record

CVE
CVE-2018-25259
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
LizardSystems
Product
Terminal Services Manager
Classifications
CWE-306, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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?

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  1. Affected versionversion=3.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

LizardSystems · Terminal Services Managerversion=3.1

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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
8.4VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/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 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-306Missing Authentication for Critical Function
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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