CVE-2021-29363Public exploit

Code execution via crafted RLE image

Published Sep 28, 2021 · Updated Aug 3, 2024

Buffer overflow in IrfanView 4.57 allows context-dependent attackers to execute arbitrary code by supplying a crafted RLE image. The FORMATS!ReadRAS_W RLE parser performs an out-of-bounds write at offset 0xa74 while decoding attacker-controlled file content. Opening the file is required, and successful exploitation runs code with the privileges of the IrfanView process.

CVSS severity7.8
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in IrfanView 4.57 allows context-dependent attackers to execute arbitrary code by supplying a crafted RLE image. The FORMATS!ReadRAS_W RLE parser performs an out-of-bounds write at offset 0xa74 while decoding attacker-controlled file content. Opening the file is required, and successful exploitation runs code with the privileges of the IrfanView process.

The record

CVE
CVE-2021-29363
Published
Sep 28, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 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-787Out-of-bounds Write
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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