CVE-2018-25427Public exploit

Code execution via oversized lookup input

Published Jun 1, 2026 · Updated Jun 1, 2026

Stack-based buffer overflow in ArmCode Arm Whois 3.11 allows attackers to execute arbitrary code through oversized lookup input. The IP address or domain field processes more than 658 bytes without enforcing the stack buffer limit, allowing crafted content to overwrite the structured exception handler and redirect execution to embedded shellcode. The demonstrated path requires access to the Windows x86 desktop application to paste the payload and initiate a lookup, after which commands run with the application's privileges.

CVSS severity9.3
Critical
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in ArmCode Arm Whois 3.11 allows attackers to execute arbitrary code through oversized lookup input. The IP address or domain field processes more than 658 bytes without enforcing the stack buffer limit, allowing crafted content to overwrite the structured exception handler and redirect execution to embedded shellcode. The demonstrated path requires access to the Windows x86 desktop application to paste the payload and initiate a lookup, after which commands run with the application's privileges.

The record

CVE
CVE-2018-25427
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
ArmCode
Product
Arm Whois
Classifications
CWE-121, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=3.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ArmCode · Arm Whoisversion=3.11

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-121Stack-based Buffer Overflow
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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