CVE-2009-20004Public exploit

Arbitrary code execution via crafted project file

Published Aug 21, 2025 · Updated May 15, 2026

Stack-based buffer overflow in gAlan 0.2.1 allows attackers to execute arbitrary code by having a user open a crafted .galan file. The .galan file parser accepts overlong input without validating its length, allowing the data to overwrite a stack buffer. Successful exploitation requires local user interaction and runs code with the privileges of the user who opens the file.

CVSS severity8.4
High
EPSS probability0.34%
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 gAlan 0.2.1 allows attackers to execute arbitrary code by having a user open a crafted .galan file. The .galan file parser accepts overlong input without validating its length, allowing the data to overwrite a stack buffer. Successful exploitation requires local user interaction and runs code with the privileges of the user who opens the file.

The record

CVE
CVE-2009-20004
Published
Aug 21, 2025
Updated
May 15, 2026
Vendor
gAlan
Product
gAlan
Classifications
CWE-121, CAPEC-100, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. May 15, 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=0 <=0.2.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

gAlan · gAlanversion=0 <=0.2.1

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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.

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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
CAPEC-100Overflow Buffers
T1204.002Malicious File
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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