CVE-2012-10043Public exploit

Arbitrary code execution via overlong imported field

Published Aug 8, 2025 · Updated Apr 7, 2026

Stack-based buffer overflow in ActFax Server 4.32 allows local users to execute arbitrary code by importing a crafted .exp file. The client interface passes an overlong tab-delimited field to strcpy() while parsing the file in Import Users from File, overflowing a stack buffer. A user must import the file with the default ECMA-94 / Latin 1 character set; successful exploitation runs code with the ActFax process privileges, including SYSTEM when it runs as a service on Windows XP.

CVSS severity9.3
Critical
EPSS probability0.35%
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 ActFax Server 4.32 allows local users to execute arbitrary code by importing a crafted .exp file. The client interface passes an overlong tab-delimited field to strcpy() while parsing the file in Import Users from File, overflowing a stack buffer. A user must import the file with the default ECMA-94 / Latin 1 character set; successful exploitation runs code with the ActFax process privileges, including SYSTEM when it runs as a service on Windows XP.

The record

CVE
CVE-2012-10043
Published
Aug 8, 2025
Updated
Apr 7, 2026
Vendor
ActFax Communication-Software GmbH
Product
ActFax Server
Classifications
CWE-121, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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=4.32

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ActFax Communication-Software GmbH · ActFax Serverversion=4.32

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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-121Stack-based Buffer Overflow
T1203Exploitation for Client Execution
T1204.002Malicious File

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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