CVE-2013-3939

Code execution via malformed RLE strip length

Published Jan 2, 2020 · Updated Aug 6, 2024

Heap-based buffer overflow in XnView Classic before 2.13 allows remote attackers to execute arbitrary code via a crafted RGB file. xnview.exe sign-extends the untrusted RLE strip size and then copies strip data without adequate bounds checking, overflowing a heap buffer. Exploitation requires a user to open the file; successful execution runs with the privileges of the XnView process.

CVSS severity7.8
High
EPSS probability1.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in XnView Classic before 2.13 allows remote attackers to execute arbitrary code via a crafted RGB file. xnview.exe sign-extends the untrusted RLE strip size and then copies strip data without adequate bounds checking, overflowing a heap buffer. Exploitation requires a user to open the file; successful execution runs with the privileges of the XnView process.

The record

CVE
CVE-2013-3939
Published
Jan 2, 2020
Updated
Aug 6, 2024
Vendor
XnSoft
Product
XnView Classic
Classifications
CWE-787, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record 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=before 2.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

XnSoft · XnView Classicversion=before 2.13

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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